RCC Structures Design
If the loading on a pre-stressed rectangular beam, is uniformly distributed, the tendon to be provided should be.

Straight above centroidal axis
Parabolic with convexity upward
Straight below centroidal axis
Parabolic with convexity downward

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RCC Structures Design
Steel beam theory is used for

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

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