RCC Structures Design
To ensure uniform pressure distribution, the thickness of the foundation, is

Kept zero at the edge
Increased gradually towards the edge
Decreased gradually towards the edge
Kept uniform throughout

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

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

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