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Retrofitting a building means

  • A.improving the performance of a structure already built
  • B.designing a new structure to the requirements of the current seismic code
  • C.demolishing an existing structure and rebuilding it on the same foundations
  • D.repairing the finishes and services of a building without touching its frame

Answer: A

The geometry, the materials and the loads are all given, and the question is what can be added or altered to close the gap between what the building has and what it needs. That constraint is what makes retrofit a different discipline from new design.

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