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<?xml-stylesheet type="text/xsl" href="https://communities.bentley.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab</link><description /><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab</link><pubDate>Wed, 23 Mar 2022 20:17:28 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Current Revision posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/23/2022 8:17:28 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
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&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;[[Curtailment length settings in slab design]]&lt;/li&gt;
&lt;li&gt;[[Design of irregular shape (L,T) of slab]]&lt;/li&gt;
&lt;li&gt;[[Can users control the load distribution in a panel?]]&lt;/li&gt;
&lt;li&gt;[[Cut out identifying issues in slab design for Etabs model]]&lt;/li&gt;
&lt;li&gt;[[How tensile factor in deflection check is calculated in RCDC for IS code?]]&lt;/li&gt;
&lt;li&gt;[[Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?]]&lt;/li&gt;
&lt;li&gt;[[RCDC fails to detect some slab panels and shows black screen]]&lt;/li&gt;
&lt;li&gt;[[How to provide input values for L/D ratio?]]&lt;/li&gt;
&lt;li&gt;[[How in-plan detailing is done in RCDC?]]&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/15</link><pubDate>Wed, 23 Mar 2022 20:17:10 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 15 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/23/2022 8:17:10 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
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&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;p&gt;[[Curtailment length settings in slab design]]&lt;/p&gt;
&lt;p&gt;[[Design of irregular shape (L,T) of slab]]&lt;/p&gt;
&lt;p&gt;[[Can users control the load distribution in a panel?]]&lt;/p&gt;
&lt;p&gt;[[Cut out identifying issues in slab design for Etabs model]]&lt;/p&gt;
&lt;p&gt;[[How tensile factor in deflection check is calculated in RCDC for IS code?]]&lt;/p&gt;
&lt;p&gt;[[Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?]]&lt;/p&gt;
&lt;p&gt;[[RCDC fails to detect some slab panels and shows black screen]]&lt;/p&gt;
&lt;p&gt;[[How to provide input values for L/D ratio?]]&lt;/p&gt;
&lt;p&gt;[[How in-plan detailing is done in RCDC?]]&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/14</link><pubDate>Tue, 15 Mar 2022 17:08:39 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 14 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/15/2022 5:08:39 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
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&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;p&gt;[[Curtailment length settings in slab design]]&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/13</link><pubDate>Tue, 15 Mar 2022 15:16:37 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 13 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/15/2022 3:16:37 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
&lt;table style="background-color:#dce5f0;border:0px solid #dce5f0;width:500px;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;span style="font-size:medium;"&gt;&lt;b&gt;Applies To&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
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&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/12</link><pubDate>Tue, 15 Mar 2022 12:56:01 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 12 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/15/2022 12:56:01 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
&lt;table style="background-color:#dce5f0;border:0px solid #dce5f0;width:500px;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;span style="font-size:medium;"&gt;&lt;b&gt;Applies To&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li style="margin:0in 0in 0pt;"&gt;[[How to fix the curtailment length in SLAB drawings?]]&lt;br /&gt;&lt;br /&gt;&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/11</link><pubDate>Tue, 15 Mar 2022 12:54:51 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 11 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/15/2022 12:54:51 PM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img alt=" " src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" /&gt;&lt;/b&gt;&lt;/h1&gt;
&lt;table style="background-color:#dce5f0;border:0px solid #dce5f0;width:500px;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;span style="font-size:medium;"&gt;&lt;b&gt;Applies To&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;ol&gt;
&lt;li style="margin:0in 0in 0pt;"&gt;[[How to fix the curtailment length in SLAB&amp;nbsp; drawings?]]&lt;/li&gt;
&lt;/ol&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/10</link><pubDate>Tue, 15 Mar 2022 05:31:47 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhisek M</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 10 posted to RAM | STAAD | ADINA Wiki by Abhisek M on 3/15/2022 5:31:47 AM&lt;br /&gt;
&lt;h1&gt;&lt;b&gt;&lt;img src="/resized-image/__size/189x60/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1647322353764v1.png" alt=" " /&gt;&lt;/b&gt;&lt;/h1&gt;
&lt;table style="background-color:#dce5f0;border:0px solid #dce5f0;width:500px;" border="0"&gt;
&lt;tbody&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
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&lt;td style="text-align:right;"&gt;&lt;b&gt;&lt;/b&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;span style="font-size:medium;"&gt;&lt;b&gt;Applies To&lt;/b&gt;&lt;/span&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Product(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;STAAD Advanced Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Version(s):&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Connect Edition&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Environment:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Area:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Concrete Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Subarea:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Slab Design&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;Original Author:&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;Bentley Technical Support Group&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td style="text-align:right;"&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;
&lt;/table&gt;
&lt;p style="margin:0in 0in 0pt;"&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/9</link><pubDate>Fri, 23 Oct 2020 16:45:48 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 9 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 10/23/2020 4:45:48 PM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;8. RCDC design the two-way slab individually. However, when I have provided same bottom reinforcement to adjacent slab it doesn&amp;rsquo;t show the continuous reinforcement in in-plan detailing drawing.&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;RCDC generate In-plan detailing and BBS drawings&amp;nbsp;for the top and bottom reinforcement. in In-plan detailing, reinforcement shown are indicative and for the individual panel. even if the reinforcement is same at bottom for adjacent slabs, it shows separate reinforcement. it doesn&amp;#39;t show any lapping and end anchorages in the drawing. in BBS drawings, user can provide the maximum length of the rebar for individual panels. here the rebars are shown for individual panels.&amp;nbsp;&amp;nbsp; it would be complex showing continuous rebars wherever possible as per the maximum length of rebar and as per the spans of adjacent slabs with end conditions&amp;nbsp;.thus for BBS, the bottom reinforcement are shown for individual panels only&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;span style="font-size:inherit;"&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/8</link><pubDate>Tue, 20 Oct 2020 10:03:21 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 8 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 10/20/2020 10:03:21 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;are&amp;nbsp; not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&lt;/span&gt;&lt;/strong&gt;&lt;span style="font-size:inherit;"&gt;RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603188177421v1.png" alt=" " /&gt;&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design.&lt;/span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt; &lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/7</link><pubDate>Tue, 20 Oct 2020 09:59:52 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 7 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 10/20/2020 9:59:52 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&lt;strong&gt; 7&lt;span style="font-size:inherit;"&gt;. There is a form in RCDC (IS 456) slab design to input the permissible limit of l/d ratio for two-way slabs.&amp;nbsp; (With defaults as 28 for SS and 32 for continuous.).&amp;nbsp; However, these values&amp;nbsp;&amp;nbsp; are not valid if the loading class in more than 3 kPa and spans up to 3.5 m.&amp;nbsp; Please clarify.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; Reply:&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; RCDC is a design software. the recommended values of L/D are available in design settings. i.e. for Two way simply supported slab it is 35 x 0.8 = 28 and for continuous slab it is 40 x 0.8&amp;nbsp; = 32. refer below snap from IS code.&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1603187962574v1.png" alt=" " /&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;strong&gt;&lt;span style="font-size:inherit;"&gt;please note that option of changing the L/D factors are available in software as per user requirements. we understand that the above ratio available in code has certain limitation of span and loadings. thus L/D ratio are available to modify by user. User can take the decision on the same and proceed with the design. it is always a user choice to select the L/D ratio which suits the design. &lt;/span&gt;&lt;/strong&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/6</link><pubDate>Mon, 24 Aug 2020 06:55:13 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 6 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 8/24/2020 6:55:13 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252097574v1.png" alt=" " /&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;Reply:&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/5</link><pubDate>Mon, 24 Aug 2020 06:54:06 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 5 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 8/24/2020 6:54:06 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li&gt;&lt;span&gt;&lt;strong&gt;6. We are designing slab in RCDC but some slab portion is not considered for design which are shown by black screen between slab.&lt;/strong&gt;&lt;/span&gt;&lt;span&gt;&lt;/span&gt;&lt;span&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598251912539v1.png" alt=" " /&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;RCDC identifies the slab based on closed polygons. The close polygons are identified based on the periphery beams. &amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;In your case, beams B13 and B29 are overlaps each other. Due to overlapping of beams there are no close polygons are identified.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;We would suggest you intersect these beams as shown below. This will not impact analysis of the structure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252004231v2.png" alt=" " /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;After intersecting the beams, RCDC is now able to read the slab properly,&lt;/span&gt;&lt;/p&gt;
&lt;p style="padding-left:90px;"&gt;&lt;span&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-54/pastedimage1598252035039v3.png" alt=" " /&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/4</link><pubDate>Thu, 06 Aug 2020 05:58:32 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 4 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 8/6/2020 5:58:32 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;1. Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;2. For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;3. RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;4. Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;5. Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/3</link><pubDate>Mon, 03 Aug 2020 11:43:06 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Abhijeet Gundaye</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 3 posted to RAM | STAAD | ADINA Wiki by Abhijeet Gundaye on 8/3/2020 11:43:06 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;strong&gt;&lt;em&gt;Which method is used for Two way slab design in ACI 318 (Metric and English) code available in RCDC?&lt;strong&gt;&lt;em&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/em&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;
&lt;p&gt;&lt;span&gt;RCDC has used Direct design method available in ACI code.&lt;/span&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/2</link><pubDate>Tue, 09 Apr 2019 11:47:48 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Madhuri Panda</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 2 posted to RAM | STAAD | ADINA Wiki by Madhuri Panda on 4/9/2019 11:47:48 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item><item><title>RCDC-Slab FAQ's</title><link>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab/revision/1</link><pubDate>Tue, 09 Apr 2019 11:30:23 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:87eff2dc-d66b-40a1-8048-afd072f69277</guid><dc:creator>Madhuri Panda</dc:creator><comments>https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/41954/rcdc-slab#comments</comments><description>Revision 1 posted to RAM | STAAD | ADINA Wiki by Madhuri Panda on 4/9/2019 11:30:23 AM&lt;br /&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Does RCDC design the irregular slab like L, T shapes and slab having more than four edges?&lt;/strong&gt;
&lt;ul&gt;
&lt;li&gt;Yes. Rectangular and odd shaped slabs can be designed in RCDC. RCDC designs the two way and irregular slab based on yield line theory. For odd shaped slab RCDC considers the largest span as shorter direction for design. For Aspect ratio (L/B) RCDC considers the outer-most dimensions of the irregular slab. As per the aspect ratio of irregular slab it identifies whether the slab is one way or two way. For design using ACI, the two way and irregular slab are based on direct design method. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;For square/rectangular panels of slab, can RCDC transfer the load to two adjacent edges (beams) only as per user choice?&lt;/strong&gt;&amp;nbsp;
&lt;ul&gt;
&lt;li&gt;No. RCDC designs the slab as per relevant clauses and based on explanation provided in relevant codes. RCDC automatically identifies continuity based on the edge conditions. User can change end conditions as per requirements. User can change the type of slab like one way or two way as per choice. RCDC will design the slab accordingly. For more information refer &amp;ldquo;Technical Discussion&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;RCDC is considering some slabs as cut-outs but actually we have modelled those slab instead of cut-outs in E-tabs&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;In E-tabs, sometimes user models single membrane or shell for many number of slabs combined in one large entity. Thus in this case, individual slabs bounded by beams can&amp;rsquo;t be read by RCDC. For more information refer &amp;ldquo;Slab auto-detection&amp;rdquo; of slab from help Content.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;Tensile factor for deflection of slabs is limited to 2.0 in IS 456 but RCDC provides value 2.26 in the design calculations. Please clarify&lt;/strong&gt;.
&lt;ul&gt;
&lt;li&gt;Calculation of tensile factor is based on the formulation available in SP24 clause 22.2.1. IS 456 has provided the graph up to value 2.0 but it is not restricted as far as formulation is concerned. Higher values can be considered in design to control the deflection.&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: E-tabs, Slab, edges, RCDC, beams&lt;/div&gt;
</description></item></channel></rss>