Discussion
An open section is built from three walls each \( 100 \) mm long and \( 2 \) mm thick. Its torsion constant is nearest to
Answer: D
Applying \( J = \tfrac{1}{3}\sum s t^3 \), each wall gives \( 100 \times 8/3 = 267 \) mm\( ^4 \), and three of them total about 800 mm\( ^4 \). Compare that with a closed cell of the same walls, whose effective value would be larger by a factor of many thousands.
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