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
Steel beam theory is used for

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

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