RCC Structures Design
For a ribbed slab

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

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
All listed here
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted

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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)
(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

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