RCC Structures Design
The width of the flange of a T-beam should be less than

Breadth of the rib plus twelve times the thickness of the slab
Distance between the centers of T-beam
One-third of the effective span of the T-beam
Least of the above

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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
Its dimensions are not decided from the diagonal tensile stress
Removal of cracks in the members due to shrinkage

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