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

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RCC Structures Design
If the shear stress in a R.C.C. beam is

Equal or less than 5 kg/cm², no shear reinforcement is provided
Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
All of these
Greater than 20 kg/cm², the size of the section is changed

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