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Q: According to safety and Serviceability Requirements of a prestressed concrete Indian standards, the final deflection on horizontal members is NOT to be greater than _____for the span of length (I).
  • A. L/125
  • B. L/250
  • C. L/300
  • D. L/330
Correct Answer: Option B - As per IS 456 : 2000, clause 23.2, The final deflection, due to all loads including the effects of temperature creep and shrinkage and measure 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 erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm whichever is less.
B. As per IS 456 : 2000, clause 23.2, The final deflection, due to all loads including the effects of temperature creep and shrinkage and measure 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 erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm whichever is less.

Explanations:

As per IS 456 : 2000, clause 23.2, The final deflection, due to all loads including the effects of temperature creep and shrinkage and measure 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 erection of partitions and the application of finishes should not normally exceed span/350 or 20 mm whichever is less.