Discussion
Consider the following statements about open sections in torsion:
1. Their torsion constant carries a cube on the wall thickness.
2. They warp freely and so suffer large stresses if restrained.
3. Their torsion constant equals the polar second moment of area.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the torsion constant of an open section carries a cube on the wall thickness, and such sections warp freely and so develop large stresses if that warping is restrained. Statement 3 is badly wrong - for a thin open section the torsion constant is a tiny fraction of the polar second moment of area.
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