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Strain hardening in reinforcement is desirable in a ductile frame because it

  • A.prevents the member from yielding at all under any load
  • B.lets the member carry increasing load while deforming past yield
  • C.allows the bar to fracture as soon as yield is reached
  • D.reduces the elongation the bar can sustain before failure

Answer: B

A rising branch after yield spreads the yielding along the bar rather than concentrating it at one crack, which greatly increases the rotation the member can sustain. This is why a minimum ratio of ultimate to yield strength is specified rather than only a minimum yield.

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