Question

For a continuous slab of 3 m x 3.5 m size, the minimum overall depth of slab to satisfy vertical deflection limits is

• A. 120 mm
• B. 100 mm
• C. 75 mm
• D. 50 mm

Answer 1

The correct option is C 75 mm

(c) As per clause 24.1. shorter of two spans spanning in two directions is used to calculate span to effective depth ratio. For two way slabs of shorter spans (up to 3.5 m) with mild steel reinforcement, span to depth ratios satisfying deflection limits are:

Simply supported slabs- 35
Continuous slabs- 40
Minimum overall depth to satisfy vertical

$limits=\frac{3000}{40}=75mm$