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For a column 400 mm × 600 mm, the spacing of special confining reinforcement from the member-dimension rule is

  • A.100 mm
  • B.150 mm
  • C.200 mm
  • D.50 mm

Answer: A

One quarter of the minimum dimension gives \( 400/4 = 100 \) mm, and the absolute cap is also 100 mm, so both criteria agree here. Using the larger dimension would give 150 mm and would breach the requirement, which is the trap in this calculation.

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