Subject DatasheetDownload PDF
I. Subject Specification
1. Basic Data
Modelling of railway tracks
Module with associated contact hours
1.4 Contact hours
|Type||Hours/week / (days)|
|name||Dr. Liegner Nándor|
|academic rank||Associate professor|
Department of Highway and Railway Engineering
1.10 Language of instruction
1.11 Curriculum requirements
1.13 Effective date
1 September 2022
2. Objectives and learning outcomes
The aim of the course is to model the superstructure of the railway track with FEM softwares with regards of load bearing capacity and stability of the track. Laboratory tests are to carry out so the results serve as basis of the FEM models. The students will get acquainted with the methods of the use and stability testing of the railway superstructure in addition to the latest developed track structures. After completing the course, they are able to determine the behavior of the various superstructures, the relationship between the bridges and the superstructure. Participants can also listen to case studies related to state-of-the-art superstructures.
2.2 Learning outcomes
Upon successful completion of this subject, the student:
- knows the most important superstructure dimensioning procedures,
- knows the latest developed superstructure elements, their background,
- knows the internal forces of a CWR track,
- knows how to model the loads transferred to the track during deceleration and acceleration of trains
- is familiar with the superstructure solutions of bridges, in connection with this, the types of rail expansion devices and their location on bridges,
- knows the theoretical background and technical solutions of the transitional sections formed at the connection of the bridges and the earthwork.
- is familiar with the theoretical background and modelling methods of the lateral stability test of the track.
- be able to form an opinion on superstructure dimensioning procedures,
- is able to determine the relevant loads using FEM models even in more complex cases,
- be able to determine the forces and displacements in a CWR superstructure in both crushed stone and flexible bearing tracks as well as in the case of a rail with expansion device,
- able to compile gap tables,
- able to model track stability testing,
- able to model load bearing capacity of railway track structural elements such as rail-joints, rail fastenings, sleepers and ballast bed, embedded rail superstructure, etc.
- cooperates with the instructor in the preparation of partial performance evaluations,
- strives for an accurate and error-free solution,
- strives for precise, professional wording in its oral and written statements,
- In the course of its written performance evaluations, it strives to produce orderly documentation of the quality and appearance expected at the researcher level.
D. Autonomy and Responsibility
- prepare responsibly for the successful completion of performance appraisals,
- perform the tasks issued during the independent partial performance assessments independently and to the best of his / her knowledge,
- openly welcomes substantiated critical remarks.
Lectures and laboratory tests with presentations, self-made home planning assignment, written and oral communication: performance evaluation, exam, and active participation in contact classes.
2.4 Course outline
|Week||Topics of lectures and/or exercise classes|
|1.||Development and evaluation of railway superstructure dimensioning procedures. Use of the Zimmermann-Eisen mann superstructure sizing method.|
|2.||Presentation of the latest rail fastening systems and track structures, developments (case study).|
|3.||Building up FEM models to model the load bearing capapcity of the railway tracks. Computation of internal forces in the track.|
|4.||Laboratory test to measure the static and dynamic stiffness of rail fastening systems and investigate the effect of stiffness on the internal forces of the track by FEM models.|
|5.||Longitudinal forces in the CWR superstructures. Determination of rail end motion in case of a superstructure with crushed stone and in case of slab tracks. Modeliing oneway change of temperature and return change of temperatue.|
|6.||Laboratory test on determining the longitudinal rail restraint of different types of rail fastenings. Effects of rail clips with reduced and increased longitudinal rail restraint.|
|7.||Modelling the effect of reduced and increased longitudinal rail restraint on expansion of the rail with FEM models in case of ballasted tracks and concrete slab tracks.|
|8.||Types of rail expansion devices. Calculation of gap tables, factors influencing its design. Structures of bridges, static layouts. Longitudinal forces arising from the movement of bridges in the rail and on the supports. Effect of loaded and unloaded superstructure. Case study.|
|9.||Modelling the effects of breaking and acceleration forces of trains, superimposed on effects of change of temperature.|
|10.||Expansion behavior of rail fiber embedded in elastic material. More accurate determination of inhibited dilatation based on experimental resistance curves. Effect of train start - up and braking.|
|11.||FEM modelling of flexible transition sections between bridges and CWR tracks. Case study on the behavior of bridge structures.|
|12.||Stability of CWR tracks against buckling, factors influencing stability. The equation of equilibrium. Options for increasing resistance of ballast bed.|
|13.||Modelling stability of CWR tracks.|
The above programme is tentative and subject to changes due to calendar variations and other reasons specific to the actual semester. Consult the effective detailed course schedule of the course on the subject website.
2.5 Study materials
Coenraad Esveld: Modern Railway Tracks, Digital Edition 2014, version 3.1, ISBN 978-1-326-05172-3
2.6 Other information
This Subject Datasheet is valid for:
II. Subject requirements
Assessment and evaluation of the learning outcomes
3.1 General rules
The assessment of the learning outcomes formulated in point A is based on two homework assignments (continuous independent partial performance assessment).
3.2 Assessment methods
|Evaluation form||Abbreviation||Assessed learning outcomes|
|Homework (small homework, one-time partial performance evaluation||HW||A.2-A.3|
|Written exam (summary performance evaluation)||E||A.1-A.7; B.1-B.6|
The dates of deadlines of assignments/homework can be found in the detailed course schedule on the subject’s website.
3.3 Evaluation system
3.4 Requirements and validity of signature
3.5 Grading system
3.6 Retake and repeat
3.7 Estimated workload
|participation in contact classes||28|
|preparing for the exam||32|
3.8 Effective date
1 September 2022
This Subject Datasheet is valid for: