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

Its dimensions are not decided from the diagonal tensile stress
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

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
Clear spacing between ribs shall not be greater than 4.5 cm
All listed here
Width of the rib shall not be less than 7.5 cm

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