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The purpose of confining the concrete core of a column with closely spaced hoops is to

  • A.let the core sustain strain well past the crushing strain of plain concrete
  • B.increase the compressive strength of the cover concrete outside the hoops
  • C.reduce the amount of longitudinal steel the column needs
  • D.prevent the column from carrying any bending moment at all

Answer: A

Hoops restrain the lateral expansion that accompanies compression, putting the core into triaxial compression so that it can keep its strength to much larger strains. The cover, being outside the hoops, spalls away and is not counted on once that stage is reached.

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