FEA Analysis for Base Plate

RE: FEA Analysis for Base Plate

Ibrahim Kadri — Thu, 25 Oct 2018 13:06:10 GMT

Yes, that was the problem, i connected the walls to the slab and it works right now. Thanks a lot.

RE: FEA Analysis for Base Plate

Modestas — Wed, 24 Oct 2018 15:58:50 GMT

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

RE: FEA Analysis for Base Plate

Ibrahim Kadri — Wed, 24 Oct 2018 15:43:02 GMT

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.communities.bentley.com/.../2275.FEA.std

RE: FEA Analysis for Base Plate

Modestas — Wed, 24 Oct 2018 15:06:21 GMT

A value of 3.256e+10 kN/m3 is being used in your model,

RE: FEA Analysis for Base Plate

Ibrahim Kadri — Wed, 24 Oct 2018 14:52:12 GMT

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?

RE: FEA Analysis for Base Plate

Modestas — Wed, 24 Oct 2018 14:43:32 GMT

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.