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

R - T
T - R
R + T
√(R² + T²)

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RCC Structures Design
For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm
All listed here
Overall depth of the slab shall not exceed four times the breadth of the rib
Width of the rib shall not be less than 7.5 cm

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