RCC Structures Design
The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

Lever arm/(Shear force × Width)
Width/(Lever arm × Shear force)
(Shear force × Width)/Lever arm
Shear force/(Lever arm × Width)

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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
Beams if shear exceeds 4 times allowable shear stress
Design of simple steel beams

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