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A retrofit that relies on the infill masonry for strength is unwise because

  • A.codes require every infill panel to be removed before any retrofit is carried out
  • B.the infill may be removed or altered by the occupants
  • C.infill masonry is stronger than reinforced concrete and would attract too much force
  • D.infill panels have no stiffness whatsoever and contribute nothing to the frame

Answer: B

A wall taken out during a refurbishment silently removes the strength the retrofit counted on, and no record of the assumption survives in the building. Where infill is relied on, it is tied into the frame and recorded as structural.

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