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

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

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