RCC Structures Design
If l₁ and l₂ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w₁ and w₂ acting on strips parallel to l₂ and l₁ is

w₁/w₂ = (l₂/l₁)²
w₁/w₂ = l₂/l₁
w₁/w₂ = (l₂/l₁)⁴
w₁/w₂ = (l₂/l₁)³

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

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

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