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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RCC Structures Design
The spacing of transverse reinforcement of column is decided by the following consideration.

Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
Forty-eight times the diameter of transverse reinforcement
The least lateral dimension of the column
All listed here

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