Subgrade modulus of Reinforced concrete
Subgrade modulus of Reinforced concrete
(OP)
HI ,
presently i am modelling the base plate and analyzing the behaviour of base plate under axial load and moment.
Can anyone let me know the subgrade modulus of reinforced conrete , which i have to use for finite element analysis
presently i am modelling the base plate and analyzing the behaviour of base plate under axial load and moment.
Can anyone let me know the subgrade modulus of reinforced conrete , which i have to use for finite element analysis






RE: Subgrade modulus of Reinforced concrete
BA
RE: Subgrade modulus of Reinforced concrete
RE: Subgrade modulus of Reinforced concrete
BA
RE: Subgrade modulus of Reinforced concrete
You could assume uniform loading under the base plate. Or linearly varying loading if there is a net moment.
For a small plate on larger concrete slab, you could assume that the mid-surface of the concrete was fixed, and treat the concrete above that as elastic in the vertical direction only.
You could include the concrete as part of the finite element problem also, which introduces other complications.
In a lot of cases, for the base plate design, assuming uniform loading on the bottom will be conservative.
Note that treating a subgrade as an elastic foundation (elastic vertically) can give considerably different results from treating it as an elastic solid. So it's an approach that is useful, but not necessarily an ideal solution, either.
If you have to use very crude approximations to get a solution to a problem, you should consider using very crude approximations that also simplify the problem. So perhaps uniform bearing and a yield-line analysis would be in order.
RE: Subgrade modulus of Reinforced concrete
Like JStephen, for a real design I prefer a simplified non-FEM approach. Even the information in the video that I mentioned seemed a little questionable to me, despite it being very well thought out.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Subgrade modulus of Reinforced concrete
BA
RE: Subgrade modulus of Reinforced concrete
Is this presentation
https://www.aisc.org/UploadedContent/2008NASCCSess...
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RE: Subgrade modulus of Reinforced concrete
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.