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Shear reinforcement in a ductile beam is designed for the shear corresponding to

  • A.the factored shear from the analysis and nothing more
  • B.half the factored shear from the analysis
  • C.the shear at first cracking of the concrete
  • D.the flexural capacity actually provided at the hinges

Answer: D

Because the hinges will develop their real capacity rather than the design moment, the shear that accompanies them can be considerably larger than the analysis suggested. Designing the stirrups for that capacity-based shear is what keeps the brittle mode from arriving first.

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