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A tuned mass damper differs fundamentally from base isolation in that it

  • A.reduces the vertical rather than the horizontal response of the structure it serves
  • B.requires no maintenance or retuning at any point during the life of the building
  • C.does not alter the path of force into the structure
  • D.is installed at the foundation rather than at the topmost storey of the building

Answer: C

The auxiliary mass works with the structure's own response, absorbing energy once the building is already moving, whereas isolation prevents much of that motion from starting. The two are complementary rather than alternatives.

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