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

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
A transverse plane section remains a plane after bending
All listed here

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RCC Structures Design
Steel beam theory is used for

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

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