RCC Structures Design
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon

All of the listed here
Breadth of the rib
Overall thickness of the rib
Centre to centre distance between T-beams

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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
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

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