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

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RCC Structures Design
For a ribbed slab

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
Width of the rib shall not be less than 7.5 cm

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