RCC Structures Design
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon

Breadth of the rib
Centre to centre distance between T-beams
All of the listed here
Overall thickness of the rib

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

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

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