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
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
If this is not possible, there are many products manufactured for your situation. Here is a link to a summary of thes approaches
http:/
www.SlideRuleEra.net
RE: Desing of Mat Foundation
RE: Desing of Mat Foundation
RE: Desing of Mat Foundation
Be sure you're figuring the critical section at the right radius.