A5040538802- Railway Engineering and Dynamics
- Geotechnical Engineering and Underground Structures
- Civil and Geotechnical Engineering Research
- Mechanical stress and fatigue analysis
- Structural Health Monitoring Techniques
- Fatigue and fracture mechanics
- Aerodynamics and Fluid Dynamics Research
- Smart Materials for Construction
- Ultrasonics and Acoustic Wave Propagation
- Infrastructure Maintenance and Monitoring
- Advanced Fiber Optic Sensors
- Machine Fault Diagnosis Techniques
- Structural Load-Bearing Analysis
- Tunneling and Rock Mechanics
- Geotechnical Engineering and Analysis
- Structural Behavior of Reinforced Concrete
- Traffic and Road Safety
- Railway Systems and Energy Efficiency
- Metal Alloys Wear and Properties
- Traffic Prediction and Management Techniques
- Electrical Contact Performance and Analysis
- Geophysical Methods and Applications
- Innovations in Concrete and Construction Materials
- Seismic Waves and Analysis
- Fire effects on concrete materials
Beijing Jiaotong University
2014-2024
China Academy of Railway Sciences
2021
Uneven subgrade frost heave has been a severe problem for the operation of high-speed railways in cold regions. In order to reveal influencing mechanism on vehicle-track system, novel FEM (finite element method) model based an explicit algorithm was proposed. model, existence leverage effect slab track, which caused by heave, realistically reproduced at first, and then vehicle started running evaluating influence whole dynamic system. Results show that plays key role analyzing besides track...
This study aimed to master the real-time temperature fields of slab tracks on cable-stayed bridges and analyze thermal deformations. The pivotal heat conduction parameters geotextile rubber pad were obtained through testing, governing equations for considering variations improved. A thermal-fluid-solid coupling model was proposed. results indicated that high temperatures track concentrated within 0.05 m depth slab. Under resistance isolation layer, both sides layer appeared obvious abrupt...
Crack propagation produced by frost heave affects the durability of slab-track structures in high-humidity and cold regions China. This work is intended to reveal evolution laws frost-heave crack propagation, establish evaluation criteria for investigate factors involved propagation. Firstly, preparing specimens with initial cracks, an experiment was designed. The process carried out means digital image correlation (DIC) technology acoustic emission (AE) technology, respectively. These...
Dynamic behavior of a new type track using the polyurethane foam solidified ballast in heavy haul railway tunnels is comprehensively investigated this study. First, dynamic model vehicle–track–tunnel interaction system was developed based on multi-body dynamics theory and finite element method. Then, effects train surrounding infrastructures were calculated compared to those traditional ballasted track. Moreover, elastic modulus area size analyzed. Results show that, bed, decreases stiffness...
During the long-term service of slab track, various external factors (such as complicated temperature) can result in a series damages. Among them, arching changes structural mechanical properties, deteriorates track geometry conditions, and even threatens operation trains. Therefore, it is necessary to detect accurately achieve effective maintenance. However, current damage detection methods cannot satisfy high accuracy low cost simultaneously, making difficult large-scale efficient...
The interface crack of a slab track is fracture mixed-mode that experiences complex loading–unloading–reloading process. A reasonable simulation the interaction between layers tracks key to studying crack. However, existing models disease have problems, such as stress oscillation tip and self-repairing, which do not simulate mixed mode cracks accurately. Aiming at these shortcomings, we propose an improved cohesive zone model combined with unloading/reloading relationship based on original...
The noise caused by rail corrugation seriously affects the operation quality of metro vehicles. In this work, corrugation, interior and wheel–rail a line were tested, test results compared with those after two kinds treatments. show that is main cause abnormal noise. in many sections exceeds limit, where clear corrugations from 31.5~63 mm are found. When train passes through section, shows increase, maximum increase higher than 25 dB(A). After increasing lateral stiffness track grinding,...
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A novel approach to reduce vibration was put forward by applying rubber concrete as backfill layer of the high-speed railway tunnel, and its feasibility analyzed based on isolation theory. three-dimensional spatial coupling model vehicle-track-tunnel-rock mass established means vehicle-track dynamics The dynamic response vehicle, track, tunnel structure under common compared. reduction performance characteristics were discussed. change in different elastic modulus damping ratios analyzed,...
Rail damping is an active and effective control method for mitigating railway vibration noise at the source. In order to investigate applicability of rail high-speed railway, a vehicle-ballastless slab track-bridge coupling dynamic model was established reduction effect bridge mid-span, pier beam gap under vehicle moving load analyzed. The results show that: max acceleration ballastless track with are obviously decreased, duration time structure also shortened. mid-span more significant than...