RCC Structures Design
For a ribbed slab

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

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

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