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The shear centre of a closed section made of a doubly symmetric box lies at

  • A.The corner of the box
  • B.The midpoint of one wall
  • C.The centroid, by symmetry
  • D.A point outside the box

Answer: C

Two axes of symmetry fix both coordinates of the shear centre at their intersection, which for such a box is also the centroid. This is one reason a symmetric torsion box is such a convenient structural form: bending and torsion decouple naturally.

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