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Desing of Mat Foundation

Desing of Mat Foundation

Desing of Mat Foundation

(OP)
I have to design a mat foundation (22ft x 16ft). Due to some environmental issues the maximum thickness of the foundation is limited to 30 in. Here are the details.
fc = 3ksi. I have used PCA mat to design the foundation. The thickness seems to be OK for flexure, punching shear and I am getting good results. The only problem where the punching shear is not satisfied is at one of the circular columns (Dia = 2ft). Here are the punching shear check details.
vu = 199 psi and vc = 164 psi.
vu - factored shear stress at the critical section
vc - factored shear resistance of concrete (without considering shear reinforcement)

Is there any solution for this problem. Can the bars provided for flexure reinforcement account for any shear resistance. Or can I provide any extra shear reinforcement to get this 30 inch mat work. Any suggestions regarding this will be greatly appreciated. Thanks

RE: Desing of Mat Foundation

Notice this thread is also posted in the "Foundation Engineering" forum.

RE: Desing of Mat Foundation

(OP)
Thankyou all for your suggestions.

RE: Desing of Mat Foundation

You should be able to add shear reinforcement in a 30" slab if required.  At a localized area, cost would be minimal.

Be sure you're figuring the critical section at the right radius.

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