RCC Structures Design
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/10 (L + 2D/3)²
WL/10 (L - 2D/3)²
WL/12 (L - 2D/3)²
WL/12 (L - D/3)²

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

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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
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

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RCC Structures Design
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

42 diameters from the inner edge of the column
42 diameters from the centre of the column
42 diameters from the outer edge of the column
24 diameters from the centre of the column

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