Berücksichtigung einer exzentrischen Lasteinleitung im Beulnachweis nach der Methode der reduzierten Spannungen in EN 1993-1-5: Teil 2: Numerische Untersuchungen

Consideration of an eccentric load introduction in the buckling check acc. to the reduced stress method in EN 1993-1-5 – part 2: numerical studies. Part 1 of this article describes the large-scale buckling tests under biaxial loading carried out at the Technical University of Munich in the course of projects, as well as their recalculation and modeling using the finite element method. The numerical model described in part 1 was extended and slightly adapted for the following parameter study. The flange is taken into account in the modeling so that the clamping effect of the freely rotating flange is included. Without the connection of a bottom plate or flange, no eccentric load can be introduced into the web, so some clamping effect is essential and therefore the assumption of Navier's support at the edge of the eccentric load introduction does not apply. The results of the numerical parameter study with the model are briefly summarized in this part 2. These are then compared and evaluated with the reduced stresses method acc. to DIN EN 1993-1-5:2019. The comparison shows that an enormous economic potential for the buckling analysis can already be achieved by considering a freely rotating flange for I-sections. Therefore, an approach is developed and presented that allows the consideration of an eccentric load introduction in the buckling analysis and at the same time conservatively accounts for the clamping effects that occur.