RCC Structures Design
The effective width of a column strip of a flat slab, is

Diameter of the column
Radius of the column
Half the width of the panel
One-fourth the width of the panel

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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
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
All listed here

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