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A Z-section beam bent by a vertical moment is a classic example because

  • A.It has two axes of symmetry
  • B.Its centroid lies outside the material
  • C.It has no axis of symmetry
  • D.It is always made of composite material

Answer: C

The Z has point symmetry but no axis of symmetry, so its product of inertia about the obvious reference axes does not vanish. It therefore deflects sideways under a purely vertical load, which makes it the standard worked example of unsymmetric bending.

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