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A beam of unsymmetric section loaded by a vertical moment alone will

  • A.Not deflect at all
  • B.Deflect vertically and horizontally
  • C.Deflect vertically only
  • D.Deflect horizontally only

Answer: B

The coupling introduced by the product of inertia means a purely vertical moment produces curvature about an inclined axis. The beam therefore moves sideways as well as downward, which is exactly why an unsymmetric section cannot be analysed with the simple formula.

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