RCC Structures Design
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

18 bar diameters
12 bar diameters
24 bar diameters
30 bar diameters

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

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