Abstract
This paper deals with the interactive behaviour of longitudinally stiffened steel bridge I-girders subjected to bending, shear and compression. This load combination is typical for cable-stayed bridge girders which are subjected aside of bending and shear to high compression force due to the introduction of the cable force. The results of a large-scale experimental test series are presented and discussed. They involve the non-linear buckling behaviour and collapse of the web. Moreover, and since the behaviour is sensitive to imperfections, for the girder panels tested, in-depth information is given on the initial geometric imperfections due to welding. The obtained ultimate resistances are further employed to assess the existing bending, shear and compression (N-M-V) interaction in EN 1993-1-5 as well as in the new draft version of the code including a method presented by Jáger et al. (2017, 2018). The results underline the need for further investigations by numerical parametric analysis to analyse a design approach for an improved N-M-V interaction.
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