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The statement a single recorded accelerogram is sufficient for design is

  • A.true, provided the record is from the same region
  • B.true, provided the peak acceleration is scaled correctly
  • C.false, because accelerograms cannot be used in design at all
  • D.false, because ground motions vary greatly between events

Answer: D

Two motions with the same peak can have very different frequency content and duration and produce quite different responses, so codes require a suite of records and use the average or the envelope. Records are certainly used in design; one is simply not enough.

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