RCC Structures Design
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon

All of the listed here
Breadth of the rib
Overall thickness of the rib
Centre to centre distance between T-beams

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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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