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A response spectrum is specific to

  • A.one structure irrespective of the motion
  • B.one construction material only
  • C.one geographical region for all time
  • D.one ground motion and one damping ratio

Answer: D

Correct answer: one ground motion and one damping ratio

Both qualifiers matter. A different record gives a different spectrum, and the same record gives a different curve at each damping value, which is why spectra are published as families of curves labelled by damping. A design spectrum is a generalisation across many records, but it too is drawn for a stated damping ratio, conventionally five per cent.

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