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Supplemental dampers are attractive in retrofit because they

  • A.remove the need for any assessment of the existing structure before the works begin
  • B.can be installed without making any connection to the existing structural frame
  • C.reduce demand without strengthening every member
  • D.increase the strength of the existing members of the frame throughout the building

Answer: C

Cutting drift by taking energy out of the response can bring the existing members within their capacity, so the intervention is confined to a few bays. That makes the work far less disruptive than jacketing columns throughout an occupied building.

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