RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

t/mc = (d - n)/n
t/mc = (d + n)/n
mc/t = n/(d - n)
mc/t = (d - n)/n

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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 - (l - x̅)
y = L/2 - (l - x̅)
y = L/2 + (l - x̅)
y = L/2 - (l + x̅)

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