桥面不平度影响下大跨斜拉桥冲击系数研究  

Research on the Impact Coefficient of Long Span Cable-Stayed Bridgesunder the Influence of Bridge Deck Unevenness

作　　者：周记国 王桂花 徐凤月 Zhou Jiguo;Wang Guihua;Xu Fengyue(School of Civil Engineering,Baicheng Normal University,Baicheng 137000,China;Transportation Institute of Inner Mongolia University,Hohhot 010000,China)

机构地区：[1]白城师范学院土木工程学院,白城市137000 [2]内蒙古大学交通学院,呼和浩特市010000

出　　处：《北方交通》2023年第7期6-10,共5页Northern Communications

基　　金：吉林省教育厅科研规划项目(JJKH20210006KJ)。

摘　　要：对客车在跨斜拉桥上行驶时的车-桥系统振动特性进行了分析,探讨了车辆对桥梁的冲击振动响应。在桥面不平度激励下建立车-桥耦合振动空间分析模型,对车辆行驶速度、横向车辆并行与交会、车辆纵向间距影响下的桥梁竖向振动及桥梁冲击系数的变化规律进行了研究。研究结果表明:桥面不平度会显著影响桥梁冲击系数,桥面不平度等级的提高使车辆对桥梁的竖向冲击作用更加明显,并且会加剧行车速度、横向行车状态及车辆纵向间距对桥梁冲击系数的影响。因此,大跨度桥梁运营过程需要保持桥面的平整度以减小车辆对桥梁的冲击作用。The vibration characteristics of the vehicle-bridge system when a passenger car runs on a cable-stayed bridge are analyzed,and the impact vibration response of the vehicle to the bridge is explored.The spatial analysis model of vehicle-bridge coupling vibration is established under the excitation of bridge deck unevenness.The variation laws of bridge vertical vibration and bridge impact coefficient under the influence of vehicle driving speed,lateral vehicle parallelism and intersection,and longitudinal vehicle spacing are studied.The research results show that:the bridge deck unevenness will significantly influence the impact coefficient of the bridge.The increase in the level of the bridge deck unevenness makes the vertical impact of vehicles on the bridge more obvious,and intensifies the influence of driving speed,lateral driving state,and vehicle longitudinal spacing on the impact coefficient of the bridge.Therefore,during the operation of large-span bridges,it is necessary to maintain the bridge deck evenness to reduce the impact of vehicles on the bridge.

关 键 词：桥面不整度 大跨斜拉桥 车-桥耦合振动 冲击系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]