This paper deals with the behaviour of thin-walled closed cross-section. Through a simple example, the different relevant effects (bending, torsion, distortion, local force) are examined. First, the elastic distribution of longitudinal stresses is determined by means of analytical, numerical methods, and with tests as well. Then, the ultimate load-bearing capacity is predicted in different ways, namely by a method which combines the critical stress with yielding condition and by Eurocode 3 regulations. The estimated capacities are compared to test results. Finally, on the base of comparison some conclusions are summed up.
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