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The statement a response spectrum applies to any damping ratio is

  • A.true, provided the period is short
  • B.false, since spectra apply only to undamped systems
  • C.false, since each curve is drawn for one damping value
  • D.true, since damping does not affect the response

Answer: C

Correct answer: false, since each curve is drawn for one damping value

Damping enters the computation of every ordinate, so a spectrum belongs to the damping value it was computed for. Spectra are therefore published as families of curves, and a code design spectrum specifies its damping - usually five per cent - together with factors for converting to other values when the structure warrants it.

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