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Bar buckling in a column is resisted by

  • A.increasing the spacing of the hoops to reduce congestion
  • B.closely spaced transverse reinforcement engaging the bar
  • C.the concrete cover surrounding the bar on the outside
  • D.increasing the yield strength of the longitudinal bar

Answer: B

Once the cover has gone, a longitudinal bar in compression is a strut whose effective length is the hoop spacing. Tying it at close intervals keeps that length short, which is why the confinement spacing rules are tied to the bar diameter.

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