RCC Structures Design
As the percentage of steel increases

Depth of neutral axis decreases
Depth of neutral axis increases
Lever arm increases
Lever arm decreases

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RCC Structures Design
In a beam the local bond stress Sb, is equal to

Total perimeter of reinforcement/(Leaver arm × Shear force)
Leaver arm/(Shear force × Total perimeter of reinforcement)
Leaver arm/(Bending moment × Total perimeter of reinforcement)
Shear force/(Leaver arm × Total perimeter of reinforcement)

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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
During deformation limits, Hook's law is equally applicable to concrete as well as to steel
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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