RCC Structures Design
If Ac, Asc and A are areas of concrete, longitudinal steel and section of a R.C.C. column and m and σc are the modular ratio and maximum stress in the configuration of concrete, the strength of column is

All listed here
σcAc + m σcAsc
σc(A - Asc) + m σcAsc
σc[A + (m - 1)Asc]

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

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

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