1. A novel modelling method for heavy-haul train-track-long-span bridge interaction considering an improved track-bridge relationship.
- Author
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He, Qinglie, Li, Shihui, Yang, Yun, Zhu, Shengyang, Wang, Kaiyun, and Zhai, Wanming
- Subjects
- *
LONG-span bridges , *BRIDGES , *COMPUTER simulation , *ELASTICITY - Abstract
[Display omitted] • A high-efficiency modeling method of train-track-long-span bridge interaction is developed and validated with field test. • The proposed model considers a more realistic track-bridge interaction relationship compared with the existing models. • Comparison with traditional models demonstrates the superiorities and significance of the proposed model. • Several crucial parameters of ballasted track system are suitably selected. A ballasted track system is a multi-layer elastic structure that exhibits complicated mechanical behaviour under trainloads. Therefore, accurate modelling of these structures is essential for revealing the characteristics of train-track-bridge interaction. This study aims to study the dynamical interaction characteristics of a heavy-haul train-track-long-span bridge system (HTTLSBS) by developing an effective modelling approach. First, based on D'Alembert principle, the vibration equations of a heavy-haul train subsystem are derived by adequately considering the mechanical behaviour of its components. Then, a highly efficient modelling methodology for a large-scale track-bridge subsystem is developed based on the component mode synthesis (CMS) method, which considers both the elasticity and load-transfer characteristics of the ballasted track and long-span bridge subsystems. The train, track, and bridge subsystems are coupled with a nonlinear wheel-rail contact relationship and an improved track-bridge interaction relationship, respectively. Subsequently, the dynamic responses acquired from numerical simulations are comprehensively compared with field test data, validating the effectiveness of the developed methodology. Suitable modal truncation frequencies of the long-span bridge model with the CMS method are also determined. On this basis, the advantages and significance of the proposed approach are demonstrated by comparing it with traditional modeling methods. Finally, by applying the proposed approach, several crucial parameters of the ballasted track system are suitably selected with the aim of reducing the vehicle-track-bridge dynamic interaction. The research results may provide useful guidance for the theoretical modelling and optimal design of HTTLSBS. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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