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Velocity-dependent and displacement-dependent devices differ importantly in that only the former

  • A.can be installed within a diagonal brace member
  • B.needs to be taken out and inspected after a significant earthquake
  • C.peaks out of phase with the elastic force in the structure
  • D.dissipates any energy at all during the response

Answer: C

A viscous device is at its largest when the structure is moving fastest, which is when the member forces are smallest, so the two do not add. A friction or yielding device peaks at maximum displacement and therefore adds directly to the member force.

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