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Compared with base isolation, supplemental damping is usually

  • A.cheaper and less disruptive to install
  • B.more effective at reducing floor accelerations in every case whatever the site
  • C.impossible to apply to an existing building without demolishing part of it
  • D.unaffected by the level of drift the structure actually experiences

Answer: A

Dampers occupy a few bays and need no moat, no flexible services and no underpinning, which is why they dominate retrofit work. Isolation gives the greater reduction in acceleration where it can be afforded and where the site suits.

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