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The IS 13920 column provisions apply to a member whose factored axial stress exceeds

  • A.\( 0.8f_{ck} \)
  • B.\( 0.008f_{ck} \)
  • C.\( 0.5f_{ck} \)
  • D.\( 0.08f_{ck} \)

Answer: D

The same threshold separates the two sets of rules from the other side: below it the member is treated in flexure, above it as a column. Axial load reduces the rotation a section can sustain, which is why the confinement requirements become more demanding.

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