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Q: As per IS:456:2000, the deflection including the effects of temperature, creep and shrinkage occurring after erection of partitions and the application of finishes of RC structures should NOT normally exceed ______.
  • A. Span/250 mm or 40 mm whichever is less
  • B. Span/350 mm or 20 mm whichever is less
  • C. Span/350 mm or 40 mm whichever is less
  • D. Span/250 mm of 20 mm whichever is less
Correct Answer: Option B - IS : 456-2000, Clause 23.2, (a) 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. (b) The deflection including the effect of temperature creep and shrinkage occurring after erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm which ever in less.
B. IS : 456-2000, Clause 23.2, (a) 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. (b) The deflection including the effect of temperature creep and shrinkage occurring after erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm which ever in less.

Explanations:

IS : 456-2000, Clause 23.2, (a) 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. (b) The deflection including the effect of temperature creep and shrinkage occurring after erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm which ever in less.