Statistical running safety analysis of high-speed trains on beam bridges after long-term service

被引:2
作者
Xiang, Ping [1 ,2 ,4 ]
Hu, Huifang [1 ,3 ]
Zhao, Han [1 ,3 ]
Zeng, Yingying [1 ,3 ]
Zhang, Peng [1 ,3 ]
Shao, Zhanjun [1 ,3 ]
Xie, Xiaonan [1 ,3 ]
Jiang, Lizhong [1 ,3 ]
机构
[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China
[2] Technol & Equipment Rail Transit Operat & Maintena, Chengdu 610031, Peoples R China
[3] Natl Engn Res Ctr High Speed Railway Construct Tec, Changsha 410018, Hunan, Peoples R China
[4] Taishan Univ, Sch Civil Engn, Tai An 271000, Shandong, Peoples R China
关键词
Train-track-bridge coupled (TTBC) system; Train running safety (TRS); Railway bridge; Random analysis; Initial rail irregularity; Uneven settlement; Creep deformation; Long-term deformation; PIER SETTLEMENT; TRACK; SYSTEM; MODEL;
D O I
10.1016/j.istruc.2024.106897
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The evolution of high-speed railways has shifted from extensive construction to long-term, secure operation. Over time, these railways face structural deformations due to specific geographical and environmental factors, impacting track smoothness and train running safety. This research examines the long-term service-induced bridge deformations' effect on high-speed train safety. A coupled dynamic system is established, encompassing high-speed trains, tracks, and bridges. In this model, initial track irregularities are treated as a stochastic process, combined with track deformations resulting from bridge deformations. Statistical parameters for the system's response are calculated utilizing a new point estimation method. Based on safety and comfort control criteria for high-speed train operations, the effects of different forms of bridge deformations are discussed, as well as their combined influence on train performance. The results reveal that lateral bridge deformations significantly affect train performance, more so than vertical deformations and should receive greater attention in practical engineering. Additionally, train performance indices increase with greater beam deflection and lateral displacement. Lastly, variations in the impact of high-speed trains on long-serving high-speed railway bridges under different operating speeds are explored. The calculated findings illuminate the intricate dynamics of high-speed trains crossing deformable bridges, underscoring the need for comprehensive bridge deformation consideration in safety assessments.
引用
收藏
页数:12
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