I am using AISC 360 code. How can I have STAAD do deflection check for service cases and do strength check for ultimate cases ?
For AISC 360-10, the design routine can do deflection checks based on SERVICEABILITY LOAD ENVELOPES and strength checks based on STRENGTH LOAD ENVELOPES as part of the same design cycle. One needs to define serviceability envelope and strength envelope first consisting of the appropriate cases and then define a LOAD LIST ENV command for the design to consider these as explained below.
For example if you have a strength load case 10 and a serviceability case 11, you can set up the design as shown next
11 ENVELOPE 1 TYPE SERVICEABILITY
10 ENVELOPE 2 TYPE STRENGTH
END DEFINE ENVELOPE
LOAD LIST ENVELOPE 1 2
CODE AISC UNIFIED 2010
*specify all design parameters here including DFF, DJ1, DJ2
CHECK CODE ALL
The Load Envelopes are for grouping load cases based on whether they are service type cases ( used for serviceability checks like deflection checks ) or strength type cases ( used for strength checks ). In the example two envelopes has been defined
Envelope 1 – Serviceability Envelope
Envelope 2 - Strength Envelope
Load case 11 has been assigned to the Serviceability envelope ( Envelope 1 ) which means that the software will only check deflections for this case.
Load case 10 has been assigned to the Strength envelope ( Envelope 2 ) which means that the software will check member strengths for this case. No deflection check will be carried out for this load case.
One can define the Load Envelopes using the Graphic user interface as shown next
More details on load envelopes can be found at section 5.40 of the Help documentation.
This is the response to the question from vivekshine.
If there is any SET command in your file, remove that and run it again. If you still get the same result, create a new thread on the forum and post your model.
I used commands as per the above example. But all design results shows error. all values shown as zero. (see below design result). Last 3 months im following bentley support. no solutions found for my Service requests.
Im facing this issues in all SS6 versions- 20.07.11.33, 20.07.11.45, 20.07.11.50.
904. LOAD LIST ENV 1 2
905. PARAMETER 1
906. CODE AISC UNIFIED 2010
953. RATIO 1 ALL
954. TMAIN 300 ALL
955. TRACK 0 ALL
956. CHECK CODE ALL
STAAD SPACE -- PAGE NO. 279
STAAD.PRO CODE CHECKING - (AISC-360-10-LRFD) v1.4a
ALL UNITS ARE - KN METE (UNLESS OTHERWISE Noted)
MEMBER TABLE RESULT/ CRITICAL COND/ RATIO/ LOADING/
FX MY MZ LOCATION
1 ST 200X16SHS (EUROPEAN SECTIONS)
PASS 0.000 -1*
0.00 0.00 0.00 0.00
CRITICAL LOAD #: -1 GENERATED LOAD #: 0 (FROM 64 COMBINATIONS)
2 ST 200X16SHS (EUROPEAN SECTIONS)
0.00 T 0.00 0.00 0.00
Here are a few more related discussions on this topic.
Please check the following post
Hi Sye what should I do , if I want to perform both serviceability and strength checks for same load case.
Is there any option.
Earlier in SS5 if we didn't mention any load envelope staad used to perform both strength and serviceability checks automatically for all load cases.