RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

None of these
(Area of the column A × Safe punching stress)/Load on column A
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)

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RCC Structures Design
The spacing of transverse reinforcement of column is decided by the following consideration.

Forty-eight times the diameter of transverse reinforcement
All listed here
Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
The least lateral dimension of the column

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