大跨度窄钢桁加劲梁悬索桥车桥耦合振动分析  

An Analysis of the Vehicle-Bridge Coupling Vibration for a Long-Span Suspension Bridge with a Slender Steel-Truss Stiffening Girder

作　　者：杨磊 邵飞 江克斌 YANG Lei;SHAO Fei;JIANG Kebin(College of Field Engineering,Army Engineer University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学野战工程学院,江苏南京210007

出　　处：《国防交通工程与技术》2018年第6期14-17,共4页Traffic Engineering and Technology for National Defence

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB046801)

摘　　要：大跨度窄加劲梁悬索桥竖向振动响应研究具有现实意义。基于动力平衡理论和有限元法建立车辆和桥梁的动力微分方程,采用空间三轴车辆模型,利用ANSYS软件编制车桥耦合振动程序进行计算。激振源为路面不平整度,利用车桥系统力与位移协调条件,应用Newmark-β法求解动力方程,分析不同车速、车重、路面等级工况下车辆荷载对大跨度窄钢桁加劲梁悬索桥跨中竖向振动响应的影响。结果表明:车速和路面等级主要对竖向振动加速度响应有较大影响,而对竖向振动位移响应影响较小;竖向振动加速度响应随车速增大而增大,随路面等级降低而增大;随车重的增加竖向振动位移响应增加,而竖向振动加速度降低。It is of certain immediate importance to study the vertical vibration response for a long-span suspension bridge with a slender steel truss stiffening girder.Based on the dynamic balance theory and the finite element method,the vehicle-bridge dynamic differential equation is established in the paper.With the spatial 3-axial vehicle model adopted,the software of ANSYS is used to program the vehicle-bridge coupling vibration and to compute the vertical vibration response.The roughness of the road is taken as the exciting source.The systematic force and displacement of the vehicle and the bridge are used to coordinate the conditions.The Newmark-βMethod is applied to solving the dynamic equation.The effects of the vehicle load in the conditions of different speeds and weights of vehicles and different grades of the conditions of the pavement on the mid-span vertical vibration response are analyzed in the paper.The result of our research shows that the vehicle velocity and the road grade chiefly have comparatively significant impact on the vertical vibration acceleration of the long-span suspension bridge with the slender steel truss stiffening girder and have comparatively little impact on the vertical vibration displacement.The vertical vibration acceleration of the bridge increases with the increase in the vehicle velocity and the decrease in the road grade.The vertical vibration displacement of the suspension bridge increases with the increase in the weight of the vehicle,but the vertical vibration acceleration of the suspension bridge decreases with the increase in the weight of the vehicle.

关 键 词：窄加劲梁悬索桥 路面不平整度 NEWMARK-Β法 车桥耦合振动 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]