RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Three-fourth of the width of the slab
Four-fifth of the width of the slab
Two-third of the width of the slab
Half of the width of the slab

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

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

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