RCC Structures Design
An under-reinforced section means

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

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

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

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