RCC Structures Design
The width of the rib of a T-beam, is generally kept between

1/3 to 2/3 of rib depth
1/7 to 1/3 of rib depth
1/2 to 3/4 of rib depth
1/3 to 1/2 of rib depth

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

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
Removal of cracks in the members due to shrinkage

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