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An angle section subjected to a vertical load through its centroid will

  • A.Bend only in the vertical plane
  • B.Carry no bending stress at all
  • C.Behave exactly as a rectangular section
  • D.Bend about an inclined axis, and twist

Answer: D

The angle is unsymmetric, so its neutral axis inclines under a vertical moment, and its shear centre lies at the intersection of the two legs rather than at the centroid, so a load applied elsewhere twists it as well. Both effects have to be handled separately.

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