RCC Structures Design
If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

w (R + T)/T
w √(R + T)/T
w (R/T)
w √(R² + T²)/T

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RCC Structures Design
For a ribbed slab

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

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