基于大范围空间转动的车-桥耦合振动分析  

Analysis of coupling vibration of vehicle-bridge system based on large range space rotation

作　　者：陈得良 全俊 CHEN De-liang;QUAN Jun(School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2018年第3期48-53,共6页Journal of Changsha University of Science and Technology:Natural Science

摘　　要：针对偶然外部强激励引起桥梁结构不同支撑发生相对运动时的车-桥耦合振动响应问题,首先利用点接触车-桥耦合动力学模型,建立了非惯性参考视角下的三维车-桥系统的耦合动力学控制方程;然后利用分离变量法对车-桥耦合动力学控制方程进行了分析;并以单跨简支梁为例探讨了梁体转速对车-桥耦合系统动力响应的影响。研究结果表明,偶然外部强激励(如地震)引起桥梁结构发生相对水平转动,由于转动角速度与桥梁结构位移、速度相互耦合,转动角速度的大小对桥梁结构振动响应具有重要影响;对此时的车-桥耦合动力系统采用非惯性参考视角下的模型进行分析,能更全面地反应实际情况,得到更准确的分析结果。In order to study the problem of vehicle bridge coupling vibration response to the relative motion of bridge structure at different support under the effect of accidental external strong excitation, a type of the close contact vehicle-bridge coupling dynamics model is presented. The separation variable method is performed to analyze the coupling equation and to discuss the dynamic response of the vehicle bridge coupled system under the non inertial reference view. With single span beam as an example, the beam body rotation velocity effect on vehicle-bridge dynamic responses of the coupled system is discussed. The researches demonstrated that in occasional strong external incentives （e.g. earthquake） caused the rela tive horizontal rotation of bridge structure, due to the rotation velocity is coupled with the displacement and velocity of the bridge structure, the angular velocity of rotation has an im- portant influence on the vibration response of the bridge structure, applying the non-inertial reference frame to describe and analyze the vehicle bridge coupled dynamic system would be more intuitive and convenient, when the bridge structure occur the horizontal rotation mo tion（relative to the ground） caused by the occasional strong external excitation.

关 键 词：车-桥耦合振动 非惯性参考视角 大范围空间运动 相对转动 动力刚化 振动响应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]