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

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

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

42 diameters from the inner edge of the column
24 diameters from the centre of the column
42 diameters from the centre of the column
42 diameters from the outer edge of the column

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