RCC Structures Design
Post tensioning system

Was widely used in earlier days
None of these
Is not economical and hence not generally used
Is economical for large spans and is adopted now a days

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

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

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