RCC Structures Design
A pre-stressed concrete member is preferred because

All listed here
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted
Removal of cracks in the members due to shrinkage

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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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RCC Structures Design
In a beam the local bond stress Sb, is equal to

Shear force/(Leaver arm × Total perimeter of reinforcement)
Leaver arm/(Shear force × Total perimeter of reinforcement)
Total perimeter of reinforcement/(Leaver arm × Shear force)
Leaver arm/(Bending moment × Total perimeter of reinforcement)

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