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The depth of a flexural member in a ductile frame is limited by IS 13920 to

  • A.one twentieth of the clear span
  • B.one quarter of the clear span
  • C.one half of the clear span
  • D.the full clear span

Answer: B

Beyond that proportion the member behaves as a deep beam in which shear rather than flexure governs, and the flexural hinge the design relies on cannot form reliably. The limit keeps the member within the range for which the standard's rules were calibrated.

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