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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RCC Structures Design
The self-weight of the footing, is

Both (b) and (c)
Not considered for calculating the area of the footing
Not considered for calculating the upward pressure on footing
Also considered for calculating the upward pressure on footing

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