RCC Structures Design
Steel beam theory is used for

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

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RCC Structures Design
The spacing of transverse reinforcement of column is decided by the following consideration.

The least lateral dimension of the column
Forty-eight times the diameter of transverse reinforcement
All listed here
Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column

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