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The classification of a cross-section depends on the width to thickness ratio of the parts subject to
compression. The classification is determined according to EN 1993-1-1 Table 5.2.
Class | Cross section capacity |
|---|---|
1 and 2 | Plastic |
3 | Elastic |
4 | Elastic (taking into account local buckling) |
Class 1
Cross sections in the class can generate plastic hinge with the rotation capacity required by the capacity design without any loss in strength.
Class 2
Cross sections of this class can develop plastic hinge with having limited rotation capacity due to local buckling.
Class 3
Cross sections of this class can reach the yield strength, but they cannot develop plastic moment resistance due to local buckling.
Class 4
In cross sections of this class, local buckling occurs in one or more parts of the cross section without reaching yield strength.
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