RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

A transverse plane section remains a plane after bending
All listed here
Variation of stress in reinforcement due to changes in external loading is negligible
During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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

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

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