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Temporary propping during retrofit work is required when

  • A.the works temporarily reduce the capacity of a member
  • B.the works add strength to a member without reducing its capacity at any stage
  • C.the building has been vacated for the duration of the strengthening works
  • D.the retrofit is confined entirely to non-structural elements of the building

Answer: A

Breaking out cover, cutting a column to insert a bearing, or removing a wall all leave the structure weaker until the new work is complete and has gained strength. The propping scheme is part of the design rather than a matter for the contractor alone.

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