高速公路大跨度连续梁桥车桥耦合动力响应与参数影响分析  

Vehicle-bridge coupled dynamic response and parameter influence analysis on highway large span continuous girder bridge

作　　者：安里鹏[1] 李德建[1] 胡立华[1] 袁鹏[1] 

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《应用力学学报》2015年第6期942-949 1099,1099,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51378504)

摘　　要：建立了空间7自由度车辆模型,推导了车辆系统总势能;根据弹性系统总势能不变值原理和"对号入座"法则,建立了车桥耦合系统动力方程,并引入桥梁路面不平顺随机激励;基于Fortran自编程序并以酉水大桥工程为背景,对大跨度连续梁桥车辆移动作用下的动力响应进行了分析,计算分析了汽车冲击系数,并采用狄克曼指标对桥梁振动舒适性进行评价;最后对动力响应参数进行了分析。结果表明:汽车冲击系数随车道数的增加而增大,且比《公路桥梁设计通用规范》中的值大;桥梁振动动力响应参数与狄克曼指标有关,通过狄克曼指标可以判断桥梁的振动舒适性,酉水大桥在正常使用情况下的狄克曼指标为0.768~2.885,振动舒适性良好。参数影响分析所得的相关结论可供高速公路大跨度连续梁桥设计施工、日常运营管理时参考。A space seven degree of freedom vehicle model is established and the total vibration potential energy is derived. Based on the stationary value principle of the total dynamic potential energy in elastic system and sit-in-right-position rule, the motion equations of time-variant vehicle-bridge coupled system are established. Meanwhile, the pavement imperfection is introduced. Corresponding analysis based on the engineering of Youshui bridge for dynamic responses of large span continuous girder bridge under moving vehicles are carried out by using program with Fortran code. The vehicle impact coefficient is then calculated, moreover, the bridge vibration comfort is evaluated with Dieckmann index. Finally, the dynamic response parameters are analyzed. Results obtained show that, the vehicle impact coefficient increases with the lane numbers, and it is larger than the value given in 'General Code for Design of Highway Bridges and Culverts'. The bridge vibration Dieckmann index is related to the parameters of dynamic response, and the bridge vibration comfort can be judged by the Dieckmann index. The Dieckmann index of Youshui bridge ranges from 0.768 to 2.885, which means the bridge vibration comfort is very good. Dynamic response parameters of vehicle-bridge coupled system are analyzed. Conclusions given by present study may provide reference for construction and design of highway long span continuous girder bridge, both for daily operation and management.

关 键 词：大跨度连续梁桥 桥面不平顺 车桥耦合系统 汽车冲击系数 振动舒适性 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U461.1[交通运输工程—道路与铁道工程]