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

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RCC Structures Design
Steel beam theory is used for

Doubly reinforced beams ignoring compressive stress in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress
Steel beams encased in concrete

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
All listed here
Clear spacing between ribs shall not be greater than 4.5 cm
Width of the rib shall not be less than 7.5 cm

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