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Concrete jacketing of an existing column consists of

  • A.replacing the existing concrete of the column entirely while it remains loaded
  • B.adding a layer of concrete with new reinforcement around it
  • C.wrapping the column in steel plates welded together along its vertical corners
  • D.injecting epoxy resin into the cracks in the existing concrete of the column

Answer: B

The new cage provides confinement, additional longitudinal steel and additional section, so both strength and ductility improve. Continuity of the new bars through the floors is the detail that decides whether the jacket works.

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