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True or false: a response spectrum is a property of the ground motion, not of any one structure.

  • A.True, though it is computed using a family of oscillators
  • B.False, since it is derived for one specific building
  • C.True, because structural properties never enter the calculation
  • D.False, since a spectrum describes a mode shape

Answer: A

Correct answer: True, though it is computed using a family of oscillators

The spectrum characterises the ground motion, which is why one curve serves every structure at the site. Oscillators do enter the computation - the ordinate at each period is the peak response of an oscillator of that period - but they are a family sweeping all periods rather than any particular building, so no structure’s properties are embedded in the result.

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