RCC Structures Design
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

30 bar diameters
24 bar diameters
18 bar diameters
12 bar diameters

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

A transverse plane section remains a plane after bending
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

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