车桥耦合振动作用下桥面沥青混凝土铺装层力学响应特征研究  

Study on Mechanical Response Characteristics of Asphalt Concrete Pavement Under Vehicle-Bridge Coupling Vibrations

作　　者：卢波 王祺顺 刘红兵 LU Bo;WANG Qishun;LIU Hongbing(Hunan Transportation Science Research Institute Co.,Ltd.,Changsha 410015,China)

机构地区：[1]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《世界桥梁》2025年第2期73-80,共8页World Bridges

基　　金：湖南省交通科技项目(202013)。

摘　　要：针对车桥耦合振动作用下沥青混凝土铺装层破损导致的行车舒适性降低问题,对车桥耦合振动作用下桥面沥青混凝土铺装层力学响应特征进行研究。综合考虑橡胶轮胎超弹性、沥青混凝土黏弹性及路面不平顺等非线性因素影响,通过轮胎与桥面接触区域相互作用力和位移变形协调条件关联二自由度车辆振动体系和桥梁振动体系建立车桥耦合振动模型,采用中心差分法求解车桥耦合振动方程,计算无路面不平顺及C级路面不平顺时车桥耦合振动作用下沥青铺装层不同位置三向振动加速度、三向剪应力以及轮胎三向接地力。结果表明:C级路面不平顺激励下,沥青混凝土底层轮迹线中点、两轮隙中点的三向振动加速度和三向剪应力均相对无路面不平顺时明显增大,三向剪应力时程曲线呈现出振荡现象,轮迹线中点三向剪应力和两轮隙中点纵向剪应力分布规律与无路面不平顺时基本相同,仅有数值上的增大,而两轮隙中点竖向和横向剪应力分布规律和数值均有明显区别;表层轮胎三向接地力均相比无路面不平顺时显著增大。This study focuses on the reduced riding comfort on bridges with damaged asphalt concrete pavement that are caused by vehicle-bridge coupling vibrations.The mechanical responses of the asphalt pavement under the action of vehicle-bridge coupling vibrations are analyzed.A vehicle-bridge coupling vibration model is established,which correlates the interaction forces and displacements in the tire-deck contact area with the vehicle-bridge vibration system of two degrees of freedom as well as the bridge vibration system,considering the nonlinear factors,including the rubber tire hyperelasticity,asphalt mixture viscoelasticity,and road roughness.The central difference method is used to derive the vehicle-bridge coupling vibration equation,to calculate the triaxial vibration acceleration,triaxial shear stress and triaxial ground contact force of tire at different locations of the asphalt pavement,under the action of vehicle-bridge coupling vibrations in the scenarios of even road surface and C-grade road roughness,respectively.The results demonstrate that in the scenario of C-grade road roughness,the triaxial vibration accelerations and triaxial shear stresses measured at the midpoint of the wheel path in the bottom asphalt concrete layer and the midpoint of the wheel backlash are significantly increased,compared with the situations in the scenario of even road surface.Abrupt changes are observed in the time history curve of the triaxial shear stress.The distribution of the triaxial shear stress at the midpoint of the wheel path and the distribution of longitudinal shear stress at the midpoint of wheel backlash aligns with the situations in the scenario of even road surface,only showing difference in values,whereas the situations concerning the vertical and transverse shear stresses at the midpoint of the wheel backlash are quite different in both pattern and value.In the scenario of C-grade road roughness,the triaxial contact force of the surface tire is significantly increased.

关 键 词：桥梁工程 车桥耦合振动 沥青混凝土铺装层 C级路面不平顺 三向振动加速度 三向剪应力 行车舒适性 

分 类 号：U443.33[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]