Longitudinally stiffened panels subjected to multi-axial stresses

bridges may be built using the incremental launching method, which is a decisive factor for the dimensioning of the steel structure. When the bridge is launched, it is of particular importance if the panel above the launching bearings in the web as well as in the bottom panel are subjected to multi-axial compressive stress states. The introduction of the forces of the support bearing into the superstructure results transverse compressive stresses in the bottom plate in the case of inclined webs. In this case, the buckling check must be carried out considering the combined stress from biaxial compression and shear.

The aim of the research project is to develop enhanced design and analysis methods for longitudinally stiffened panels subject to combined stresses due to multi-axial stress states. The reduced stress method, which is widely used in Germany especially, is to be investigated and extended regarding the multi-axial stress state.

The outcomes of this research project are intended to make the following innovative contributions:

• Clarification of the load-bearing behaviour of longitudinally stiffened panels subject to multi-axial stress.
• Clarification of whether the separate verification of the longitudinal stiffeners is necessary or covered by the global verification.
• Clarification of the column-like behaviour under transverse stresses
• Clarification of the column-like behaviour under multiaxial stresses
• Clarification of the structural behaviour of panels under dominant transverse stresses and investigation of the interpolation between plate-like and buckling-bar-like behaviour
• Review of the rules of EN 1993-1-5 for multi-axial stressed panel
• Comparison of the two launching systems in the incremental launching method and clarification of the respective influence on the buckling behaviour

Universität Stuttgart
Institut für Konstruktion und Entwurf
Prof. Dr.-Ing. Ulrike Kuhlmann, Vahid Pourostadt

Technische Universität München
Lehrstuhl für Metallbau
Prof. Dr.-Ing. Martin Mensinger

DASt e.V. / AIF

01.12.2018 - 30.06.2021