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Enough modes must be included in a spectrum analysis to capture a stated fraction of the

  • A.total height of the structure
  • B.total cost of the structure
  • C.number of members in the frame
  • D.total mass of the structure

Answer: D

Codes typically require modes summing to 90 per cent of the mass, because a mode carrying little mass contributes little to base shear. Truncating too early understates the response, particularly for irregular buildings.

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