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Punching shear-continuous conc. wall on mat foundation

Punching shear-continuous conc. wall on mat foundation

Punching shear-continuous conc. wall on mat foundation

(OP)
How do you check punching shear in a mat foundation with a continuous concrete wall sitting over it. I know how to calculate the critical perimeter for a column sitting on a foundation but I am not sure about a continuous wall.

RE: Punching shear-continuous conc. wall on mat foundation

I typically look at this on a per linear foot basis... the shear will be the same as a column only with a shear resistance on two sides, not four.

RE: Punching shear-continuous conc. wall on mat foundation

For the condition that you described, there is no such thing as "punching shear". The governing shear limit state is "beam shear". When the aspect ratio of columns gets very large, the punching shear strength of the concrete diminishes from 4 x square root of f'c to 2 x square root of f'c. When the element bearing on the mat is a wall then the shear strength of the concrete is 2 x square root of f'c.

I hope I explained that clearly enough.

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