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A student uses the polar second moment of area to compute the twist of an I-section beam. The result will be

  • A.Conservative but wasteful
  • B.Correct only for short beams
  • C.Badly unconservative; J is far smaller
  • D.Correct

Answer: C

An open section such as an I has a torsion constant orders of magnitude below its polar second moment of area, so the calculation would predict far less twist than actually occurs. The error is unconservative, which makes it a dangerous one.

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