RCC Structures Design
In a singly reinforced beam, the effective depth is measured from its compression edge to

Longitudinal central axis
Tensile reinforcement
Neutral axis of the beam
Tensile edge

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

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

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