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Designing a structure to remain fully elastic through the severest expected shaking is usually rejected because

  • A.the codes contain no method by which an elastic design can be carried out
  • B.elastic behaviour is impossible to achieve in any material at any cost
  • C.the cost would be far out of proportion to the risk being covered
  • D.elastic structures are known to collapse more readily than inelastic ones

Answer: C

Such an event is rare, and paying for the full elastic strength at every site would be extravagant. The accepted alternative is to design for a fraction of the elastic demand and to detail the structure so that it can dissipate the balance by yielding, which is what the response reduction factor represents.

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