RCC Structures Design
The minimum number of main steel bars provided in R.C.C.

Octagonal columns is 8
Circular columns is 6
Rectangular columns is 4
All listed here

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RCC Structures Design
Steel beam theory is used for

Beams if shear exceeds 4 times allowable shear stress
Design of simple steel beams
Steel beams encased in concrete
Doubly reinforced beams ignoring compressive stress in concrete

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