RCC Structures Design
The amount of reinforcement for main bars in a slab, is based upon

Maximum bending moment
Minimum shear force
Minimum bending moment
Maximum shear force

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RCC Structures Design
Steel beam theory is used for

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

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