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A supplemental damping device reduces the seismic response of a structure by

  • A.dissipating energy so that the structure has less to absorb itself
  • B.increasing the mass of the structure and so its inertia
  • C.increasing the strength of the structural members of the frame directly
  • D.removing the need for any lateral load resisting system

Answer: A

Devices installed in braces or between storeys take a share of the energy that would otherwise have to be absorbed by the frame yielding. Drift and member demand both fall, which makes the approach attractive for retrofitting an existing building.

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