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The storey drift under the design lateral force, computed with a partial load factor of unity, is limited by IS 1893 to

  • A.0.004 times the storey height
  • B.0.04 times the storey height
  • C.0.4 times the storey height
  • D.0.0004 times the storey height

Answer: A

For a storey three metres high this permits twelve millimetres of relative movement between its floors. The limit protects partitions, cladding and services from damage, and it also keeps second-order effects within bounds.

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