FEA.std
Hello everyone,
I need help for the attached model.
I am doing the FEA on StaadPro and i created the model as attached. However, the problem is that i cannot see any stress distribution on the plate after analysis. Can somebody help me on solving the problem?
You have used a very large value of Subgrade Modulus, so the stresses on the plate become very small. Try to use a more realistic value of Subgrade Modulus and the results should become more reasonable.
As a side note, whenever you use tension/compression only springs, you should combine primary load cases as Repeat Loads, not Load Combinations.
For subgrade modulus calculation, i have followed Ks=40 x FOS x qa (Reference: Foundation Analysis and Design ( Fifth Edition ) by Joseph E. Bowels Page 503 , Equation 9-9 ) equation. In my case, FOS = 3 and qa = 100 kn/m2. Therefore, i found the value as 12000 kn/m3. Is there something that i am missing in that calculation?
A value of 3.256e+10 kN/m3 is being used in your model,
Oh i missed that point, sorry about that. I have updated my model but still have same issue, the plate does not have any stress. Unfortunately I couldn't find the reason for this problem.2275.FEA.std
Walls are not connected correctly to the slab. More detais on this topic an be found here: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/20702/connectivity-issues
Answer Verified By: Ibrahim Kadri
Yes, that was the problem, i connected the walls to the slab and it works right now. Thanks a lot.