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The minimum tension reinforcement ratio IS 13920 requires in a flexural member is

  • A.\( 0.85/f_y \)
  • B.\( 0.024\sqrt{f_{ck}}/f_y \)
  • C.zero
  • D.\( 0.24\sqrt{f_{ck}}/f_y \)

Answer: D

The expression makes the minimum depend on both the concrete and the steel grade, so that the section does not fail suddenly the moment the concrete cracks. It is more demanding than the corresponding provision for ordinary beams, which is calibrated for gravity loading alone.

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