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The statement a response spectrum tells the designer how the structure will move at each instant is

  • A.true, since it is derived from the time history
  • B.true, but only for the fundamental mode
  • C.false, since it applies only to rigid structures
  • D.false, since it gives only peak values

Answer: D

Correct answer: false, since it gives only peak values

A response spectrum is a plot of the maximum response of each oscillator, and the maximum is all it retains - the sign and the instant at which it occurred are discarded in the computation. Knowing how the structure moves at each instant requires a time-history analysis, which is precisely the extra information that method provides.

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