RCC Structures Design
In a singly reinforced beam

Compression is borne entirely by concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Steel possesses initial stresses when embedded in concrete
Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

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

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