A flat plate of width b and thickness t loaded in axial compression is not susceptible to local buckling because there is no intersection of plates to provide a stiff axis. Classification for axial compression is therefore irrelevant.
If the plate is acting as a beam with the minor axis vertical, lateral torsional buckling about the minor axis does not occur.
Lateral torsional buckling can occur due to bending about the major axis. It is assumed that the member is not likely to be designed plastically so the relevant limit is that for Class 3. SCI recommends a value of b/t ≤ 19ε to provide a conservative limit for the Class 3 – Class 4 boundary.
Contact: Richard Henderson
Tel: 01344 636555
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