Influence on Vehicle-track-subgrade System Dynamic Response Induced by Track Stiffness Variation

被引：0
|
作者：
Shu Y. [1 ]
Shan Y. [1 ]
Zhou S. [1 ]
Yang X. [1 ]
机构：
[1] Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai
来源：
Shan, Yao (shanyao@tongji.edu.cn) | 1600年 / Science Press卷 / 45期
关键词：
Coupling dynamics; Failure probability; High speed railway; Stochastic finite element method; Transition zone;
D O I：
10.11908/j.issn.0253-374x.2017.05.014
中图分类号：
学科分类号：
摘要：
Focusing on the effect of stiffness variation of transition zone on vehicle-track-subgrade system dynamic response, and based on the theory of the railway system dynamics, a plane strain finite-infinite element model was employed to investigate the system dynamics of a subgrade-bridge transition zone. In this model, the vertical force coupling for the rail and the substructure was achieved by modifying the fastening spring stiffness matrix and the infinite element method was employed to prevent the wave reflection on boundaries. With this model and the stochastic finite element method based on the Latin hypercube sampling method, the influence of the parameter variability of subgrade stiffness on dynamic response of vehicle-track coupling system in the transition zone was investigated. The results show that: the influence of the variability of subgrade stiffness on the rail vertical dynamic displacement is greater than that of the wheel-rail contact force and the acceleration of the vehicle body. The dynamic response of transition zone is more sensitive to the parameter variability of the filler in the transition zone than that of the subgrade surface layer. Dynamic response data deviate from normality, and at the 95% confidence level, the maximum value of the acceleration of the vehicle body and the wheel-rail force approximately obey the Weibull distribution. While the data distribution of the maximum value of the rail vertical dynamic displacement presents obvious “high peak and thick tail”, and it is easy to appear the abnormal large value. In order to reduce the vertical dynamic displacement of the rail and facilitate the construction quality control, the subgrade stiffness of the transition section should be improved. The maximum value of the rail vertical dynamic displacement is selected as the safety evaluation index of the dynamic design of the transition zone and the result reveals that the fuzzy failure probability of the current design is 0.000 45 and the design is safe. © 2017, Editorial Department of Journal of Tongji University. All right reserved.
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页码：721 / 731
页数：10
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