| Abstract: | Fatigue behaviour of thin‐walled coldformed steel profiles. Current design concepts for thin‐walled structural members take local buckling into account in determining the ultimate capacity. Local buckling may be accompanied by large deformations, which entail secondary bending stresses. Such secondary stresses can be neglected in usual design, but there are no information available regarding their influence on fatigue design. For the investigation of that problem fatigue tests were carried out with thin‐walled cold‐formed U‐channels exposed to pure bending. Following the systematically numerical investigations it will be proposed to limit the cyclic load by 60% of the ultimate load in order to avoid fatigue damage of thin‐walled cold‐formed profiles. |
