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Special confining reinforcement in a column is required over a length from each joint face equal to the larger of the member depth, 450 mm and

  • A.one sixtieth of the clear span of the member
  • B.the full clear span of the member
  • C.one sixth of the clear span of the member
  • D.one half of the clear span of the member

Answer: C

The three criteria between them cover deep members, long members and small members, and the largest governs. That length is where the plastic hinge would form if the capacity hierarchy were breached, so it is confined as a precaution even in a strong-column design.

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