RCC Structures Design
If L is the effective span of a R.C.C. beam which is subjected to maximum shear qmax at the ends, the distance from either end over which stirrups for the shear, are provided, is

(L/2) (1 - 3/qmax)
(L/3) (1 - 5/qmax)
(L/2) (1 - 5/qmax)
(L/2) (1 - 2/qmax)

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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
Its dimensions are not decided from the diagonal tensile stress
Removal of cracks in the members due to shrinkage
All listed here

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