RCC Structures Design
Steel beam theory is used for

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

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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
A transverse plane section remains a plane after bending
All listed here
During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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