On Seismic Response and Hazard of Girder Falling for High-Speed Railway Bridge Considering Constrain Effects of Rail

Xiaodan Sun, Junyi Wang, Jinzhen Lin, Qianqi Xu, Yang Xu, Yu Liu
{"title":"On Seismic Response and Hazard of Girder Falling for High-Speed Railway Bridge Considering Constrain Effects of Rail","authors":"Xiaodan Sun,&nbsp;Junyi Wang,&nbsp;Jinzhen Lin,&nbsp;Qianqi Xu,&nbsp;Yang Xu,&nbsp;Yu Liu","doi":"10.1002/eer2.70002","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>During the 2022 M6.9 Menyuan earthquake, a high-speed railway bridge that is 5 km away from the fault experienced complex movements of girders but no girder falling, which is a contrast with the “Domino” falling of girders of a highway bridge that is 7 km away from the fault during the 2021 M7.4 Maduo earthquake. Inspired by the comparison, this paper investigates the constraint effects of the rail on the movement of the bridge which is usually ignored in seismic response of the bridge. The finite element model of an 8-span simply-supported girder bridge with CRTS I double-block ballastless tracks laying on top is established. Five groups of three-component earthquake records were selected as seismic input to test the constraint effects of the rail under different seismic loads. The results show that, with the constraint of the rail, the amplitude and duration of the acceleration response at the middle span in the longitudinal direction increases, whereas the longitudinal displacement difference between the beam joint and the pier top decreases, reducing the risk of girder falling. In the transverse direction, the rail constraint leads to the reduction of the displacements of the side spans. In the vertical direction, the constraint effect of the rail does not significantly change the peak acceleration and displacement of the bridge.</p></div>","PeriodicalId":100383,"journal":{"name":"Earthquake Engineering and Resilience","volume":"4 1","pages":"116-131"},"PeriodicalIF":0.0000,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eer2.70002","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Earthquake Engineering and Resilience","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/eer2.70002","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

During the 2022 M6.9 Menyuan earthquake, a high-speed railway bridge that is 5 km away from the fault experienced complex movements of girders but no girder falling, which is a contrast with the “Domino” falling of girders of a highway bridge that is 7 km away from the fault during the 2021 M7.4 Maduo earthquake. Inspired by the comparison, this paper investigates the constraint effects of the rail on the movement of the bridge which is usually ignored in seismic response of the bridge. The finite element model of an 8-span simply-supported girder bridge with CRTS I double-block ballastless tracks laying on top is established. Five groups of three-component earthquake records were selected as seismic input to test the constraint effects of the rail under different seismic loads. The results show that, with the constraint of the rail, the amplitude and duration of the acceleration response at the middle span in the longitudinal direction increases, whereas the longitudinal displacement difference between the beam joint and the pier top decreases, reducing the risk of girder falling. In the transverse direction, the rail constraint leads to the reduction of the displacements of the side spans. In the vertical direction, the constraint effect of the rail does not significantly change the peak acceleration and displacement of the bridge.

考虑钢轨约束的高速铁路桥落梁地震反应及危害研究
在2022年门源6.9级地震中,距离断裂带5公里的高速铁路桥发生了复杂的主梁运动,但没有主梁倒塌,这与2021年玛多7.4级地震中距离断裂带7公里的公路桥的主梁“多米诺骨牌”倒塌形成了对比。在对比的启发下,本文研究了桥梁地震反应中通常被忽略的轨道对桥梁运动的约束作用。建立了上部铺设CRTS - 1双块无砟轨道的8跨简支梁桥有限元模型。选取5组三分量地震记录作为地震输入,测试了钢轨在不同地震荷载作用下的约束效果。结果表明:在钢轨的约束下,跨中纵向加速度响应的幅值和持续时间增大,梁节点与墩顶之间的纵向位移差减小,降低了梁倒塌的风险;横向上,钢轨约束使侧跨位移减小。在垂直方向上,钢轨的约束作用对桥梁的峰值加速度和位移影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信