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

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

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RCC Structures Design
Steel beam theory is used for

Doubly reinforced beams ignoring compressive stress in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress
Steel beams encased in concrete

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