RCC Structures Design
An under-reinforced section means

Steel is provided at the underside only
Steel provided is insufficient
Steel provided on one face only
Steel will yield first

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

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

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

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

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