Dynamic and Long-Term Behavior of the Railroad
Objectives
It is intended that the trainees review and acquire knowledge about the mechanical behavior of railways, both the short-term dynamic behavior and the long-term behavior. A description of the main aspects and intervening factors is made, and the most common representation models present in the bibliography are presented. Situations in which the dynamics of the vehicle-road interaction can decisively influence both the instantaneous behavior (short-term) and the evolution of the longitudinal leveling of the road (long-term) are also identified and described.
General characterization
Code
12379
Credits
2.0
Responsible teacher
José Nuno Varandas da Silva Ferreira, Zuzana Dimitrovova
Hours
Weekly - 1
Total - 22
Teaching language
Português
Prerequisites
• Trainees should have previous knowledge of classical mechanics, from the point of view of the concept of forces, tensions and deformations, and the definition of constitutive models.
Bibliography
• Slides from CVF (Varandas, 2020)
• Esveld, C. (2001) Modern Railway Tracks, 2nd Edition, MRT-Productions;
• Popp, K., Schiehlen, W., (2003) System dynamics and long-term behaviour of railway vehicles, track and subgrade, Springer;
• Varandas, J.N., (2013) Long-term behaviour of railway transitions under dynamic loading, Tese de doutoramento, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
Teaching method
Essentially expository classes, using slides and practical examples taken from real situations.
Some classes with a calculus component, in a hands-on regime whenever possible.
Evaluation method
One report elaborating about one of the topics described in this discipline, and one final test
Subject matter
• Resilient instantaneous behavior of railways;
• Long-term behavior (in terms of permanent deformation) of railways;
• Models of railway vehicles and actions imposed on the railway;
• Numerical modeling of vehicle-road interaction;
• Case studies: rail irregularities, undulating wear, track defects, sleeper insoles;
• Aspects of dimensioning of railways;
• Railway transition zones;
• Specific effects associated with high speed.