Research PaperNo Access

Creep Effect on the Dynamic Response of Train-Track-Continuous Bridge System

School of Civil Engineering, Central South University, Changsha 410075, Hunan, P. R. China

State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, P. R. China

E-mail Address: pxiang2-c@my.cityu.edu.hk

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Minglong Wei

School of Civil Engineering, Central South University, Changsha 410075, Hunan, P. R. China

E-mail Address: 1225793519@qq.com

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Mengmeng Sun

School of Civil Engineering, Central South University, Changsha 410075, Hunan, P. R. China

E-mail Address: jiexiasunmeng@163.com

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Qiusheng Li

Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, P. R. China

E-mail Address: bcqsli@cityu.edu.hk

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Lizhong Jiang

School of Civil Engineering, Central South University, Changsha 410075, Hunan, P. R. China

E-mail Address: lzhjiang@csu.edu.cn

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Xiang Liu

School of Civil Engineering, Central South University, Changsha 410075, Hunan, P. R. China

E-mail Address: liuxiang1619@163.com

Corresponding author.

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, and

Jianying Ren

State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, P. R. China

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https://doi.org/10.1142/S021945542150139XCited by:22 (Source: Crossref)

Abstract

The influence of track irregularity and deck deformation on the running safety of high-speed railway (HSR) trains is investigated, with emphasis placed on those caused by the creep of continuous prestressed bridges. A bridge model is established with CRTS II ballastless track to account for a train-track-bridge (TTB) system. The creep effect is calculated by the finite element software MIDAS/Civil. The accuracy of the numerical simulation is confirmed by comparing the numerical predictions with field measurements. Considering the stability index of the moving train, the deformation threshold for safe operation of the train is determined. The results show that the initial prestressing stress has a great impact on the residual deformation of the bridge, but the deformation of the rail is less affected by the stiffness of the fastener. Creep irregularity has a great influence on the comfort of the moving train, but does not affect its running safety. When the creep amplitude is greater than 4mm, the increase in the amplitude of the creep irregularity has a greater effect on the acceleration of the car body.

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