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

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

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RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Area of the column A × Safe punching stress)/Load on column A
None of these
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)

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