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This and the next three slides give examples in which there is significant post buckling stability.
This slide shows the “classical” case of the development of diagonal tension in the shear web of a beam in bending. Buckles in the web reduce somewhat the overall effective bending stiffness of the beam, but the beam does not fail. Instead, “diagonal tension” develops along the long axis of the buckles, simulating truss members and giving the beam an effective transverse shear stiffness.
Vertical members are required to prevent the diagonal tension in the web from pulling together the top and bottom horizontal members (flanges) of the beam.
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