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The first hoop in a flexural member should be placed from the joint face at a distance not exceeding

  • A.50 mm
  • B.150 mm
  • C.300 mm
  • D.the full effective depth of the member

Answer: A

Correct answer: 50 mm

The code requires the first hoop within 50 mm of the joint face. The reason is that the plastic hinge forms immediately adjacent to the joint, and it is exactly there that the concrete must be confined and the compression bars restrained against buckling - so leaving the usual spacing at the very end of the member would omit the confinement where it is most needed.

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