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A metallic yielding damper dissipates energy by

  • A.plastic deformation of steel plates or bars within the device
  • B.the compression of a gas held within a sealed chamber in the device
  • C.friction between two clamped steel surfaces
  • D.the flow of fluid through a calibrated orifice

Answer: A

Concentrating the yielding into a replaceable device keeps the damage away from the structural members themselves. Such devices are inspected after a significant earthquake and changed if they have deformed beyond their rated range.

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