冰-车-桥系统耦合振动分析  

Ice-vehicle-bridge coupled system vibration analysis

作　　者：吴甜宇 邱文亮 WU Tianyu;QIU Wenliang(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]大连理工大学建设工程学部,大连116024

出　　处：《振动与冲击》2022年第15期20-28,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51778108);中国博士后科学基金(2021M690522);省部共建山区桥梁及隧道工程国家重点实验室开放基金(SKLBT-2101)。

摘　　要：为了研究桥梁结构在车辆和冰荷载共同作用下的振动反应,提出了冰-车-桥系统耦合动力分析框架。在该框架中,每辆车都被视为一个多自由度的运动系统,桥梁结构采用有限元方法进行建模,利用罚函数定义了车轮与桥面之间的接触关系,实现了各子系统之间的接触与交互作用。基于自激冰力模型得到了依赖于冰与结构相对速度的桥梁结构自激冰力,构建了冰-车-桥系统的耦合动力方程,进而开展了冰-车-桥系统耦合振动分析及行车安全评估。研究结果表明:桥梁竖向振动反应随车速的增加而增大,桥梁横向振动反应则受到了冰荷载的控制;车辆的竖向反应主要依赖于车-桥之间的相互作用力,车辆的横向反应则受冰与桥梁之间相互作用力的主导,车辆与桥梁的交互作用受到了车速和冰速的双重影响;快冰速会增大车辆的横向接触力,降低车辆的最小侧滑抗力,不利于行车安全;冰荷载作用下桥上车辆的前轴车轮比后轴车轮更容易发生侧滑;所提出的冰-车-桥系统耦合动力分析框架可为冰荷载作用下跨海桥梁的行车安全评估提供参考。Here,to study vibration response of bridge structure under combined action of vehicle and ice load,an ice-vehicle-bridge coupled system dynamic analysis framework was proposed.In this framework,each vehicle was regarded as a multi-DOF motion system.The bridge structure was modeled using the finite element method.The contact relation between vehicle wheel and bridge surface was defined with the penalty function method to realize contact and interaction among subsystems.Based on the self-excited ice force model,the self-excited ice force of bridge structure depended on relative velocity between ice and structure was obtained,dynamic equations of ice-vehicle-bridge coupled system were built,and then vibration analysis and driving safety evaluation of ice-vehicle-bridge coupled system were performed.The results showed that vertical vibration response of bridge increases with increase in vehicle speed,while bridge transverse vibration response is controlled by ice load;vehicle vertical vibration response is mainly dependent on interaction between vehicle and bridge,while vehicle lateral vibration response is dominated by interaction between ice and bridge,and interaction between vehicle and bridge is affected by both vehicle speed and ice speed;fast ice speed can increase lateral contact force of vehicle,and reduce the minimum side slip resistance of vehicle,it is not conducive to vehicle driving safety;under action of ice load,front axle wheels of vehicle are easier to have side slip than its rear axle wheels be;the proposed ice-vehicle-bridge coupled system dynamic analysis framework can provide a reference for vehicle driving safety evaluation of sea-crossing bridges under ice load.

关 键 词：桥梁结构 自激冰力 冰-车-桥系统 耦合振动 行车安全 

分 类 号：U447[建筑科学—桥梁与隧道工程]