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Reducing the mass of an existing building is an effective retrofit because

  • A.a lighter building has a shorter natural period and therefore attracts less force
  • B.the strength of the existing members increases as the load upon them is reduced
  • C.removing mass improves the confinement of the concrete in the existing columns
  • D.seismic force is generated by the mass itself

Answer: D

Removing heavy floor finishes, replacing masonry partitions with light ones, or taking off an upper storey all reduce the demand in direct proportion. It is one of the few measures that improves matters without adding anything new to the structure.

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