RCC Structures Design
In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

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

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RCC Structures Design
Steel beam theory is used for

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

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