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The torsion constant of an open thin-walled section is approximately

  • A.Twice the enclosed area times the thickness
  • B.The enclosed area squared over the perimeter
  • C.The polar second moment of area
  • D.One third of the sum of s times t cubed

Answer: D

The St Venant result for a narrow rectangle carries the cube on the thickness, and an open section is treated as a sum of such strips. The cube is what makes an open section so soft in torsion: halving the wall thickness cuts the stiffness by eight.

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