RCC Structures Design
The diameter of the column head support a flat slab, is generally kept

5.0 cm larger than the diameter of the column
4.0 cm larger than the diameter of the column
0.25 times the diameter of the column
0.25 times the span length

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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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