RCC Structures Design
Steel beam theory is used for

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

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted
All listed here

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