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Removing the topmost storey of an existing building as a retrofit measure

  • A.reduces both the mass and the overturning moment
  • B.increases the seismic force on the storeys that remain beneath it in the building
  • C.has no effect on the seismic demand
  • D.requires the foundations to be enlarged to carry the redistributed loading

Answer: A

Mass removed from the top has the greatest effect on base shear and on overturning, because of the height at which the code applies the force. It is drastic and reduces the lettable area, so it is used where nothing gentler will serve.

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