声明
ACKNOWLEDGEMENTS
ABSTRACT
摘要
NOMENCLATURE
TABLE OF CONTENTS
LIST OF FIGURES
LIST OF TABLES
1.INTRODUCTION
1.1.General Background
1.2.Problem Statement
1.3.Research Objectives and Scope
1.4.Methodology
1.5.Thesis Outline
2.LITERATURE REVIEW
2.1.Introduction
2.1.1.Ballasted Tracks
2.1.2.Ballasted Track Components
2.2.Track Loading
2.2.1.Vertical Forces
2.2.2.Lateral Forces
2.2.3.Longitudinal Forces
2.2.4.Impact Forces
2.2.5.Wheel-rail interaction
2.3.Subgrade Problems
2.3.1.Ballast degradation
2.3.2.Subgrade degradation
2.3.3.Hanging sleepers
2.4.Chapter Summary
3.DYNAMIC MODELING
3.2.Modeling in ABAQUS
3.2.1.Modules
3.2.2.Elements
3.3.Dynamic Coupling Model
3.3.1.Vehicle Model
3.3.2.Wheel-Rail Contact Model
3.3.3.Contact Property Definition
3.3.4.Track Model
3.3.5.Track Irregularities
3.4.Chapter Summary
4.RESULTS AND DISCUTIoNS
4.1.Introduction
4.2.Model Validation
4.3.Super Structure Dynamic Responses
4.3.1.Effect of Gap Size
4.3.2.Effect of Number of Hanging Sleepers
4.4.Substructure Responses
4.4.1.Effect on Subgrade Stress
4.4.2.Effect on Subgrade Deterioration
4.5.Comparison between Narrow Gauge and Standard Gauge tracks dynamic responses
4.6.Chapter Summary
5.CONCLUSION
5.1.Conclusion
5.2.Recommendations
5.3.Suggestions for Future Researches
REFERENCES
THESIS DATA FORM