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

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

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

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

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