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

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

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