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

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RCC Structures Design
As per IS : 456, the reinforcement in a column should not be less than

0.7% and not more than 7% of cross-sectional area
0.6% and not more than 6% of cross-sectional area
0.8% and not more than 8% of cross-sectional area
0.5% and not more than 5% of cross-sectional area

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