High-Speed Railway Bridges, Conceptual Design Guide, Romo J., Pérez-Caldentey A., Cuadrado M., 2024

High-Speed Railway Bridges, Conceptual Design Guide, Romo J., Pérez-Caldentey A., Cuadrado M., 2024.

   At the request of the authors, I have been given the honour of writing the foreword to this book, which is devoted to railway bridges. It develops the aspects referring to their structural conception, taking into account the characteristics of railway traffic: actions, limit states, speeds, etc., and includes a detailed analysis of the superstructure of the track with its different components and singular elements (for example, expansion devices) that allow the correct behaviour of the track.




Dynamic Amplification and Resonance.
On railway bridges, there are a number of factors that lead to a dynamic response of the structure under traffic loads.

On the one hand, the loads are fast so there is an impact effect. On the other hand, the trains are composed of a more or less long succession of vehicles which means that the loads are repeated, so the dynamic effect is amplified. Finally, the imperfections of both the track and the vehicles create disturbances in the value and the way of applying the loads, which leads to an increase in the response of the structure.

Therefore, the actual forces and deformations of a bridge due to rail traffic are of a dynamic nature and their values can be considerably higher than those due to static actions. In order to take this amplification into account in the calculations, an impact or dynamic magnification coefficient is applied to the static loads, a coefficient established in the design standards on the basis of statistical studies carried out on bridges in service.

Contents.
Foreword.
About the Authors.
Acknowledgements.
1 Introduction to High-Speed Railway Bridges.
2 Track for High-Speed Bridges.
3 Conceptual Design of High-Speed Railway Bridges.
4 Design Basis.
5 Dynamic Behaviour of High-Speed Railway Bridges.
6 Longitudinal Track–Structure Interaction.
7 Conceptual Design for Maintenance.
Appendix A Basic Concepts of Dynamics.
Appendix B Singular Bridges for High-Speed Railway Lines.



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