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Which statement about a shear web is TRUE?

  • A.It carries the bending moment of the spar
  • B.It must never be allowed to buckle
  • C.It carries no load once it has buckled
  • D.It may buckle and carry diagonal tension

Answer: D

Wagner's diagonal tension theory shows a buckled web carries far more than its buckling load as inclined tension bands, and designing for that state deliberately saves weight. The flanges and uprights must be sized for the inward pull it produces.

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