大跨度高低塔斜拉桥车-桥动力响应  

Train-bridge dynamic response of long-span cable-stayed bridge with unequal-height towers

作　　者：王俊新 周建庭[1,2] 吴月星 陈兆玮 李轩 WANG Junxin;ZHOU Jianting;WU Yuexing;CHEN Zhaowei;LI Xuan(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering(Chongqing Jiaotong University),Chongqing 400074,China;College of Civil Engineering,Hunan City University,Yiyang,Hunan 413000,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]山区桥梁及隧道工程国家重点实验室(重庆交通大学),重庆400074 [3]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《中国科技论文》2023年第4期351-357,399,共8页China Sciencepaper

基　　金：国家自然科学基金资助项目(U20A20314,51908094);重庆市技术创新与应用发展专项重点项目(cstc2019jscx-gksbX0047)。

摘　　要：针对大跨度高低塔斜拉桥刚度非对称将导致车-桥空间耦合振动过程更为复杂这一现象,以主跨480 m的高低塔钢箱叠合梁斜拉桥——重庆南纪门长江大桥为工程背景,基于车-桥动力相互作用理论,采用自编程建立车-桥耦合动力模型,分析不同行车模式(列车运行速度、编组数量、运行方向)和高低塔侧刚度差异对车-桥动力响应的影响。结果表明:随着列车运行速度的提高,车-桥系统振动增大;随着列车编组数量的增加,列车振动无明显变化,桥梁振动逐渐增大;桥梁主跨跨中竖向动位移对列车编组数量更敏感,跨中竖向加速度对列车运行速度更敏感;列车运行方向对列车振动影响较小,对桥梁振动则有较大影响;低塔侧主梁各位置处的振动较高塔侧更大。Aiming at the phenomenon that the asymmetric stiffness of long-span cable-stayed bridge with unequal-height towers will complicate the spatial coupling vibration process of train-bridge system,taking the Chongqing Nanjimen Yangtze river bridge with unequal-height towers-steel box composite beam cable-stayed bridge with main span of 480 m as the engineering background,based on the train-bridge dynamic interaction theory,a train-bridge coupling dynamic model was established to analyze the influence of different driving modes(train running speed,number of train formation and running direction) and the stiffness difference between high and low tower sides on the train-bridge dynamic response.The results show that the vibration of train-bridge system increases with the increase of train speed.With the increase of the number of train formation,the train vibration has no obvious change,but the bridge vibration increases gradually.The vertical dynamic displacement in the middle of main span is more sensitive to the number of train formation,and the vertical acceleration in the middle of main span is more sensitive to the train speed.The train running direction has little influence on the train vibration,but has great influence on the bridge vibration.The vibration of the main beam of the low tower side is larger than that of the high tower side.

关 键 词：高低塔斜拉桥 车-桥动力相互作用理论 行车模式 动力响应 刚度差异 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]