The maximum allowable vertical deflection under live load for a cantilever member supporting brittle cladding in an industrial building is:

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SSC JE CE Previous Year Paper 10 (Held on 30 Oct 2020 Evening)
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  1. Span/240
  2. Span/180
  3. Span/120
  4. Span/150

Answer (Detailed Solution Below)

Option 4 : Span/150
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Explanation:

As per IS 800:2007, Clause No. 5.6.1:

The maximum vertical deflection for cantilever beam:
  • Supported by elastic cladding, deflection is limited to Span/120.
  • Supported by brittle cladding, deflection is limited to Span/150.

The maximum vertical deflection for simply supported beam:

  • Supported by elastic cladding, deflection is limited to Span/240.
  • Supported by brittle cladding, deflection is limited to Span/300.
  • Max deflection < L/325 of the span in general

As per IS 456:2000, Clause 23.2:

The deflection shall generally be limited to the following:

  • The final deflection due to all loads including the effects of temperature, creep, and shrinkage and measured from the as-cast level of the supports of floors, roofs, and all other horizontal members, should not normally exceed span/250.
  • The deflection including the effects of temperature, creep and shrinkage occurring after the erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm whichever is less.
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