Floor to floor height is 3.5m. The building is liable to overcrowding as it’s a public building. Stairs are supported on brick walls 230 mm thick at the ends of landings (i.e. landing spans parallel to stairs). Provide M20 concrete & Fe415 steel. Fixing the dimensions of risers & treads for the human comfort is expected. Carry out the necessary checks. Show the reinforcement details. Use limit state method.

1. Given:

Hall dimension: $3m \times 6m$

Floor to Floor height: $3.5m$

Brick wall: $230mm$

M20 concrete

Fe 415 Steel

Assume: Floor finish = 1 and Liveload = $3 kN/m$

Floor to floor height = $3.5m$

Floor to floor height / Flight = $\frac{3.5}{2} = 1.75 = 1750 mm$

Assume …