基于简化计算模型的中国高速铁路桥梁横向地震分析  

Transverse seismic analysis of high-speed railway bridge in China based on a simplified calculation model

作　　者：周旺保 彭东航 刘丽丽 张云泰 赖志鹏 余建 蒋丽忠 ZHOU Wang-bao;PENG Dong-hang;LIU Li-li;ZHANG Yun-tai;LAI Zhi-peng;YU Jian;JIANG Li-zhong(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China)

机构地区：[1]School of Civil Engineering,Central South University,Changsha 410075,China [2]National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China

出　　处：《Journal of Central South University》2023年第1期351-364,共14页中南大学学报（英文版）

基　　金：Projects(U1934207, 52078487, 52178180) supported by the National Natural Science Foundations of China;Project(2019RS3009) supported by the Innovative Province Construction Special Project of Hunan Province,China;Project(202011) supported by the Transportation Science and Technology Project of Hunan Province,China;Project(502501006) supported by the Innovation-driven Project of Central South University,China;Projects(HJGZ20211003, HJGZ20212009) supported by the State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,China。

摘　　要：在高速铁路简支梁桥的地震分析中,轨道结构的约束作用不容忽视。尽管其计算效率很高,但由于未考虑轨道结构,桥梁模型可能会产生不合理的地震响应。考虑轨道结构的桥梁轨道模型非常复杂,其地震分析计算效率低。因此,建立高速铁路桥梁抗震分析的简化计算模型具有重要的工程实用价值。本文通过在主梁之间设置非线性弹簧,建立了高速铁路桥梁横向地震分析的简化模型。这些弹簧可以精确模拟轨道结构对桥梁的约束作用。利用简化模型对一座五跨高速铁路桥梁进行了地震分析,并将其地震响应与不考虑轨道结构的模型和考虑轨道结构的模型进行了比较。结果表明,在不同地震记录下,桥梁模型和桥梁轨道模型的地震响应吻合良好,验证了简化模型的计算精度。与桥轨模型相比,简化模型的计算时间显著缩短。轨道结构在频繁地震下基本处于弹性阶段,而在设计地震和罕遇地震下,轨道结构的刚度将降低。In seismic analyses of high-speed railway simply-supported bridges, the constraint imposed by the track structure is non-negligible. Despite its great computational efficiency, the bridge model(BM) may produce an unreasonable seismic response, because it does not consider the track structure. The bridge-track model(BTM), which considers the track structure, is very complex, and its computational efficiency for seismic analysis is low. Therefore,developing a simplified calculation model for seismic analysis of high-speed railway bridges has great practical engineering value. In this paper, the simplified bridge-track model(SBTM) for transverse seismic analysis of high-speed railway bridges is established by setting nonlinear springs between girders. These springs can accurately simulate the constraint that the track structure imposes on the bridge. Seismic analysis of a five-span high-speed railway bridge is carried out using the SBTM, and the seismic response is compared to that of BM and BTM. The results show that the seismic responses of both SBTM and BTM match well under different seismic records, which validates the calculation accuracy of SBTM. Compared with the BTM, the calculation time of the SBTM is significantly shorter. The track structure is basically in the elastic stage under frequent earthquakes, while under design earthquakes and rare earthquakes, the stiffness of the track structure will degrade.

关 键 词：高速铁路桥梁 CRTSⅡ型无砟轨道 简化模型 计算效率 轨道约束 退化界限 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]