RCC Structures Design
If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

√(R² + T²)
R + T
T - R
R - T

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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
A transverse plane section remains a plane after bending
Variation of stress in reinforcement due to changes in external loading is negligible

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