RCC Structures Design
To ensure uniform pressure distribution, the thickness of the foundation, is

Kept uniform throughout
Kept zero at the edge
Decreased gradually towards the edge
Increased gradually towards the edge

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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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