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

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

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Half of the width of the slab
Four-fifth of the width of the slab
Three-fourth of the width of the slab
Two-third of the width of the slab

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