RCC Structures Design
Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as

1/10th of the span
1/8th of the span
1/16th of the span
1/12th of the span

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

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

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