RCC Structures Design
If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

D = W (a² - b²)/4abq
D = W (a² - b²)/4a²bq
D = W (a - b)/4a²bq
D = W (a² - b²)/8a²bq

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
Large size of long beams carrying large shear force need not be adopted
All listed here
Its dimensions are not decided from the diagonal tensile stress

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