RCC Structures Design
High strength concrete is used in pre-stressed member

All listed here
To provide high bond stresses
To overcome high bearing stresses developed at the ends
To overcome bursting stresses at the ends

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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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