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The IS 13920 provisions for flexural members apply to a member whose factored axial stress does not exceed

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

Answer: C

Above that stress the member is treated as a column and the more demanding confinement rules apply. The threshold separates members whose behaviour is dominated by flexure from those in which axial load governs, since the two fail in quite different ways.

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