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Retrofit work carried out while a building remains occupied requires

  • A.the complete removal of all the finishes and services throughout the building
  • B.the strengthening of every member of the frame simultaneously in one operation
  • C.no more care in the sequencing of the work than an unoccupied building would
  • D.schemes that can be built from outside or in stages

Answer: D

Exoskeletons, external buttresses and bay-by-bay bracing all suit occupied buildings, whereas jacketing every column does not. Temporary propping and the sequence in which capacity is removed and restored have to be designed as carefully as the permanent work.

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