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A building has adequate stiffness but insufficient strength. The appropriate retrofit is to

  • A.install a tuned mass damper at roof level to reduce the response of the building
  • B.add capacity to the deficient members
  • C.add stiffness throughout the building until the drift falls well below the code limit
  • D.reduce the mass of the upper storeys until the drift is halved from its present value

Answer: B

Where drift is already acceptable, the deficiency is in what the members can carry, and jacketing, wrapping or added elements answer it. Reducing mass also helps, since it lowers demand, and is worth considering alongside.

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