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

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

During deformation limits, Hook's law is equally applicable to concrete as well as to steel
All listed here
Variation of stress in reinforcement due to changes in external loading is negligible
A transverse plane section remains a plane after bending

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