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Hoops used for confinement in a ductile frame are required to have hooks bent at

  • A.180 degrees with the extension left outside the cover
  • B.135 degrees with an extension into the core
  • C.90 degrees with a short extension outside the core
  • D.45 degrees with no extension at all

Answer: B

A hook turned into the core cannot open out when the cover spalls, whereas a right-angled hook straightens and releases the confinement just when it is needed. The extension is specified as six bar diameters and not less than sixty-five millimetres.

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