RCC Structures Design
As per IS : 456, the reinforcement in a column should not be less than

0.6% and not more than 6% of cross-sectional area
0.8% and not more than 8% of cross-sectional area
0.7% and not more than 7% of cross-sectional area
0.5% and not more than 5% of cross-sectional area

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

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

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