Resonance susceptibility of high-speed railway bridges
In this context, the German Railways (Deutsche Bahn AG) currently carries out a reassessment project which deals with the investigation of the dynamic compatibility of bridges located across the entire German railway network. It was motivated by the introduction of the new high-speed train ICE 4, whose carriage lengths lie outside of the validity range of the high speed load models for dynamic analysis (HSLM) specified in the European Standards (Eurocode EN 1991-2). However, such reassessment processes are mostly cumbersome and require significant financial efforts. In order to avoid further circumstances of this kind, a tighter collaboration between bridge engineers and vehicle developers is envisaged in the near future in Germany. One of its main aims is represented by the development of optimized vehicles with respect to their axle arrangements, which should reduce the resonance susceptibility of the railway bridges, for example by detuning the excitation through non periodical axle arrangement, i.e. variable spacing of axle groups. This project, coordinated also in cooperation with the German Railways, is going to conduct preliminary numerical investigations on this topic. Fundamental knowledge in The development of ever faster and heavier vehicles with innovative axle arrangement, the continuous expansion of the high-speed railway networks in many countries all over the world as well as the current tendency to an increasingly internationalized railway traffic represent significant evolutions in the railway industry of the last decades. These lead to an imperative necessity for the reassessment of the mechanical behavior of infrastructure elements with respect to their structural capacity and serviceability. This is particularly important for bridge structures, as the changes in the axle arrangement of the vehicles and the increased travel speeds have a direct influence on the excitation frequencies, which lie often outside of the frequency spectra assumed in the initial design phase of the bridge. As a result, the resonance susceptibility of the bridges might increase and hence their dynamic behavior has to be reassessed prior to the subjection to the new load situations. structural dynamics is explicitly required, while basic MATLAB skills are desirable.
Two IREP student(s) can work on this project.
Pre-requisites or requirements for the project
- Fundamental knowledge in Structural Dynamics
Recommended literature and preparation
- General literature to dynamic analysis of high-speed railway bridges
until the end of June 2018