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Discussion

An inelastic design spectrum is obtained from the elastic one by

  • A.multiplying the ordinates by the importance factor
  • B.shifting the curve towards shorter periods
  • C.increasing the assumed damping to 20 per cent
  • D.dividing the ordinates by a response reduction factor

Answer: D

Ductile structures are permitted to yield, dissipating energy and surviving a demand greater than their elastic strength, so the design force is reduced accordingly. The price is accepted damage and a requirement for detailing that delivers the assumed ductility.

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