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Adding a new frame inside an existing building as a retrofit measure

  • A.works but consumes usable floor space
  • B.requires no new foundations
  • C.leaves the natural period of the building entirely unchanged in both directions
  • D.is the least disruptive of all the measures available for an occupied building

Answer: A

Correct answer: works but consumes usable floor space

A new internal frame is effective and can be tied readily to the existing floors, but it stands where the occupants would otherwise be and it needs new foundations beneath it. That loss of space is what drives owners towards an external solution where appearance permits.

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