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In a diagonal tension field beam, the web is allowed to

  • A.Carry the full load without ever buckling
  • B.Take no load at all
  • C.Carry only compression
  • D.Buckle, then carry inclined tension bands

Answer: D

Wagner showed that a thin web may buckle at a small fraction of its ultimate load and still carry far more as a series of inclined tension straps, provided the flanges and uprights can react the resulting inward pull. Accepting the buckling rather than preventing it is what makes such a beam light.

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