max moments and deflection
Good day, I am new in staad, can someone help me with my question?
my question is how to get the maximum moments and deflection of each beams in staad? what load cases to be consider? I am planning to design beams manually and I am planning to get the…
Regarding deflection limitations in RCC design
How can we restrict the deflection of beam in RCC design, Just as we can limit the deflection in steel design by giving parameter DFF ???
To view the strip-based long term deflection for AS3600
Choose Layers > Rule Set Designs > Max Service Design > L.T. Deflection Plan
In the help manual showing that long-term deflection can be viewed from the above selection. However, in my model Max. Service Design tab hasn't had the L.T. Deflection Plan…
RE: Assign camber to a beam
No, camber is always selected by the program based on the deflections and camber criteria. RAM SS - Steel Beam Deflection and Camber
RE: Deflection of a concrete beam as per ACI
No it does not use the effective moment of inertia. For the analysis, it uses the gross moment of inertia multiplied by any reduction factors that the user may specify through the Property Reduction Factors. Users of course can directly specify moment…
RE: deflection in z direction
In addition to what vivekshine mentioned above, here is another place to check the deflections in z
RE: A pinned-pinned column deflection
Most likely you applied pinned support at the top node in which case, the downward deflection of the top node would be prevented and the load would directly go to the top support. You may use FIXED BUT FY support at the top node so that the top node can…
RE: Deflection check result interpretation
The LOC within the Deflection check refers to the location of the critical section for deflection. It is measured from the start of the member. The one under the heading “Loading/Location” refers to the location of the section which is critical for the…
RE: Design - Deflection Check / Print Maximum ratio
If there are multiple design sets, the results for the last set is displayed in the Beam Unity check tables or when plotting the design ratios. More explanation on this and a couple of workarounds can be found in the following wiki
http://communities…
RE: AISC 360 code check-strength and serviceability
In recent versions of the software, there has been a change in the way the design is carried out for strength and serviceability as per the AISC 360 code. It requires definition of strength and serviceability load envelopes.
The following wiki outlines…
RE: Deflection is not showing in output
I see consistent results reported and both sections of design report a PASS as seen below.
I think it is your version. Please update the software to the latest version ( 20.07.11.82 ) and it should take care of the issue.
RE: Deflection is not showing in output
For the deflection checks to be carried out as per the AISC 360 codes, you need to define serviceability ( and strength ) envelopes before you do the design. Please refer to the following wiki for details on how to set up the design
http://communities…
RC wall modelling in RAM Concept
Hi there,
I have some doubts modelling RC walls in the RAM Concept. Having the walls as shear wall which would restrain the slab improves the deflection in the slab, other properties are fixed near and compressible. I also have another opinion which…
RE: Creep coefficient Eurocode
The creep model used in Ram Concept for Load History deflections is based on ACI 209R-92. Refer to the program manual section 67.3.2 for some general information.
For further reading see this wiki post:
RAM Concept Load History Calc Options TN …
Actual Deflection in STAAD Using Eurocode
Hi.
I obtained .663m as actual deflection in STAAD using Eurocode (EN1993-1-1:2005).
When checked thru manual computation of deflection, result was different.
I have 1.6kN/m^2 uniform load acting on UPN Channel with beam's length 4.1m.
Does this…
RE: STADD.Pro V8i - Direct Analysis Method AISC 350-05 / 10
The purpose of DIRECT ANALYSIS is to compute the member forces for strength design. For computing drifts, deflections you should use a PDELTA 15 ANALYSIS with the un-reduced stiffness and not a DIRECT ANALYSIS. Both analysis commands could be part of…
RE: Deflection check results in SS6
The Limit : 0.656 refers to the allowable value ( in cm ) which should be obtained by dividing the Deflection Length (L) /360. As per your screenshot, it seems like your physical member is 6m long and so I would expect this value to be 600/360 = 1.67…
RE: RAM ECR parameters
A colleague who is more familiar with the AS 3600 code offered this help.
AS 3600 breaks down total shrinkage into autogenous shrinkage and drying shrinkage, whereas Concept only has a single value for shrinkage that represents the combination. I think…
RE: Long Term Deflections for ACI318 in RAM Concept
The L.T. Deflection Plan is no longer a standard plan, since load history deflections are the recommended method for long term deflections. However, you can create a new plan and plot the strip-based L.T. Deflections as follows:
1. Click on the Layers…
RE: Load History Deflections in Concept to British or EU standards
I'm sure lots of engineers have used Concept for this purpose.
I assume you are using Load History analysis.
Alt Envelope factors are not used in Load History analysis, only the standard load (and pattern is used). The program manual, section 67.1…
RE: Deflection check on Pitched Roof & flat roof
The reason you are getting the deflection failures for the pitched portal is that, STAAD.Pro is connecting the nodes DJ1 and DJ2 by a straight line and calculating the deflections of the pitched member with respect to that line. You should not check deflections…
Truss Deflection DJs
I have a question about how to set-up the design parameters to accurately check the top chord deflection of a pitched truss. The high-point of the truss occurs at the midpoint between the two support columns.
For a flat truss, I would normally define…
Difference in values of deflection
Hi
Ive modelled a steel deck structure, set the design parameters and included deflection check to EC.
However staad gives different deflection values between the output and the member pop up window>deflection>load type>global>ydir
It is a substantial…
RE: need to confirm allowable Deflection for composite steel truss and concrete
Often the vertical deflection limit of a structure depends on the materials, cladding, etc. and are not code-dictated. L/240 is a common limit we see used int he US for floors under dead + live load together. L/200 might be OK for a roof, but there is…
RE: RAM Concrete Beam - Effective Depth used for Deflection Calculations when Reinforcing Continuous at Beam Depth Change
Your images did not come through, but if I understand correctly, you have two consecutive spans that are different depth beams with continuous top bars across the support, but the d value used in the deflection checks is less than expected.
Splicing…