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

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RCC Structures Design
If the depth of actual neutral axis of a doubly reinforced beam

Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
All listed here
Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously

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