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

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

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
Clear spacing between ribs shall not be greater than 4.5 cm
All listed here
Width of the rib shall not be less than 7.5 cm

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