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A section that warps freely under torsion develops

  • A.Large direct stresses from the warping
  • B.No shear stresses at all
  • C.Uniform direct stress across the section
  • D.No additional direct stresses from the warping

Answer: D

Warping only generates direct stress when it is prevented. Where the member is free to warp, the axial displacements occur without restraint and pure torsion theory applies unmodified. Restraint at a root fitting is the usual place the extra stresses arise.

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