RCC Structures Design
With usual notations the depth of the neutral axis of a balanced section, is given by

mc/t = n/(d - n)
t/mc = (d - n)/n
t/mc = (d + n)/n
mc/t = (d - n)/n

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RCC Structures Design
Steel beam theory is used for

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

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