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A design base shear of 1,600 kN is computed elastically. With a response reduction factor of 4 and an importance factor of 1.0, the design base shear is

  • A.6,400 kN
  • B.1,600 kN
  • C.1,200 kN
  • D.400 kN

Answer: D

The response reduction factor divides the elastic demand, giving \( 1{,}600/4 = 400 \) kN, on the understanding that ductile detailing will let the structure absorb the rest inelastically. Multiplying by the factor instead inverts the intention of the clause.

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