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This and the next three slides give examples in which there is significant post buckling stability; the structures are not imperfection sensitive.
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 effective overall 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 shear stiffness.
Vertical members are required to prevent the diagonal tension from pulling together the top and bottom horizontal members (flanges) of the beam.
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