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

T - R
R + T
R - T
√(R² + T²)

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RCC Structures Design
Steel beam theory is used for

Steel beams encased in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress
Doubly reinforced beams ignoring compressive stress in concrete

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