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The response spectrum method treats a multi-storey building as

  • A.a beam carrying only vertical loads
  • B.an assembly with no dynamic properties
  • C.a set of single-degree-of-freedom systems, one per mode
  • D.a single rigid block moving with the ground

Answer: C

Each mode behaves like an independent oscillator with its own period and participating mass, which is what allows a spectrum built for single-degree systems to be applied to a real frame. The modal results are then combined.

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