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Connections between new and existing structure in a retrofit are critical because

  • A.codes require them to be made without any drilling into the existing concrete
  • B.force must pass through them for the new work to do anything
  • C.they carry no force but must be made watertight against the weather
  • D.the new work is always stronger than the existing structure it is attached to

Answer: B

Chemical anchors, dowels and shear keys are what let the added element take its share, and a connection that slips leaves the new work as an ornament. Pull-out testing of a sample of anchors is standard practice for that reason.

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