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The response reduction factor IS 1893 assigns to a load bearing building in unreinforced masonry is

  • A.3.0
  • B.4.0
  • C.1.5
  • D.5.0 as for a special moment resisting frame

Answer: C

Unreinforced masonry has almost no capacity to deform inelastically, so the code allows only a small reduction from the elastic demand and such buildings are accordingly designed for a large force. Adding horizontal bands raises the factor, and adding vertical bars at corners and jambs raises it further.

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