车辆参数对大跨钢管混凝土拱桥车桥耦合振动响应的影响规律研究  

Study on Influence Law of Vehicle Parameters on Vehicle-bridge Coupling Vibration Response of Long-span Concrete-filled Steel Tube Arch Bridge

作　　者：于鹏 余存 任兆永 覃玉海 贺盛 王龙林[3] 无 YU Peng;YU Cun;REN Zhaoyong;QIN Yuhai;HE Sheng;WANG Longlin;无(School of Civil Engineering and Construction,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of the Ministry of Education(Guangxi University),Nanning 530004,China;Guangxi Bossco Environmental Protection Technology Co.,Ltd.,Nanning 530007,China;Guangxi Jiaoke Group Limited,Nanning 530207,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室(广西大学),广西南宁530004 [3]广西博世科环保科技股份有限公司,广西南宁530007 [4]广西交科集团有限公司,广西南宁530207

出　　处：《湖南大学学报(自然科学版)》2025年第1期118-131,共14页Journal of Hunan University:Natural Sciences

基　　金：广西重点研发计划资助项目(桂科AB22036007);广西高校引进海外高层次人才“百人计划”资助项目。

摘　　要：车辆运行会引起桥梁振动,随着跨径增大,桥梁非线性增加,车桥耦合作用愈加明显.本文以575 m大跨钢管混凝土拱桥广西平南三桥为研究对象,对其开展了脉动试验和现场无障碍行车试验,同时建立了精细化车桥耦合有限元模型,进行了不同车速、车重影响下的车桥耦合振动响应分析,探索其响应规律,并提取桥梁重要截面处的冲击系数与现行规范计算值比较,讨论现行规范对该桥的适用性.结果表明:计算结果与现场脉动试验结果吻合良好,不同工况下的动应变时程曲线变化趋势基本一致.车速在20 km/h~60 km/h范围内,该桥的动力响应与车速大小无明显关系,当车速超过60 km/h时,挠度会随车速增加而急剧增大.车重增加会导致该桥最大动挠度增加,冲击系数减小,但桥梁实际的总响应并未减小.因此,严格控制过桥车辆的速度和车重,可有效降低行车荷载对桥梁的冲击效应.Vehicle traveling can cause bridge vibration.As the span increases,bridge non-linearity increases and vehicle-bridge interaction becomes more pronounced.In this paper,a 575m long-span concrete-filled steel tubular arch bridge,Guangxi Pingnan Third Bridge,is taken as the study objective.Pulsation tests and accessibility field tests were carried out on it.Meanwhile,a refined vehicle-bridge coupling finite element model was established.Vehicle-bridge coupling vibration response under different vehicle speeds and vehicle weights was analyzed to explore its response law.Besides,the dynamic coefficient of control sections of the bridge is also calculated and compared with that calculated by the current code to discuss the applicability of the current code to this bridge.The results show that the numerical results are in good agreement with the results of the field pulsation tests,and the trend of the dynamic strain time course curve under different conditions is basically the same as that of the field tests.There is no significant relationship between the dynamic response of the bridge and the vehicle speed within the speed range of 20 km/h to 60 km/h.When the vehicle exceeds 60 km/h,the deflection increases sharply with the speed.The increase in vehicle weight leads to an increase in the maximum dynamic deflection of the bridge and a decrease in the impact coefficient,but the actual total response of the bridge does not decrease.Therefore,the speed and weight of the vehicles crossing the bridge should be strictly controlled to effectively reduce the impact effect of the traffic load on the bridge.

关 键 词：车桥耦合响应 大跨钢管混凝土拱桥 现场试验 精细化有限元 冲击系数 

分 类 号：U441.7[建筑科学—桥梁与隧道工程]