Design open well staircase. Draw the plan showing flight details, mid-landings etc. Draw reinforcement details in a flight. Grade of concrete is M20 and steel Fe415.

Step 1:

Floor to floor height = 3.1m (Open well)

M20 Fe415

$fck = 20 N/mm^2$

$f_y = 415 N/mm^2$

$M - 0.138 \ fck \ bd^2$

Step 2: Preliminary Dimensions

Floor to floor height = 3.1m

height of each fright = $\frac{3.1}{2} = 1.55m$ But in this case we …