RCC Structures Design
For a ribbed slab

Width of the rib shall not be less than 7.5 cm
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

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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
Large size of long beams carrying large shear force need not be adopted
Its dimensions are not decided from the diagonal tensile stress

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RCC Structures Design
If the length of a combined footing for two columns l meters apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load, is (where x̅ is the distance of centre of gravity of column loads).

y = L - (l - x̅)
y = L/2 - (l - x̅)
y = L/2 - (l + x̅)
y = L/2 + (l - x̅)

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