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

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

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RCC Structures Design
As per IS : 456, the reinforcement in a column should not be less than

0.5% and not more than 5% of cross-sectional area
0.8% and not more than 8% of cross-sectional area
0.6% and not more than 6% of cross-sectional area
0.7% and not more than 7% of cross-sectional area

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