Question

For an industrial building, the allowable vertical deflection of a cantilever beam of span 5 m supporting the brittle cladding and subjected to live load is ______.
1. 41.66 mm
2. 33.33 mm
3. 10 mm
4. 20 mm

Answer 1

Correct Answer - Option 2 : 33.33 mm

Concept:

As per IS 800:2007, Clause No. 5.6.1

The maximum vertical deflection for cantilever beam:

a) Supported by elastic cladding, deflection is limited to Span/120.

b) Supported by brittle cladding, deflection is limited to Span/150.

Calculation:

Span of beam = 5 m = 5000 mm

Vertical Deflection = 5000/150 =  33.33 mm

The maximum vertical deflection for simply supported beam:

a) Supported by elastic cladding, deflection is limited to Span/240.

b) Supported by brittle cladding, deflection is limited to Span/300.

c) Max deflection < L/325 of the span in general