摘要
根据移动荷载识别结果,将车辆荷载简化模拟为线性三角形荷载函数,且通过将该荷载在不同时间作用于有限元模型的各个节点来模拟车辆的移动,并将车速的变化反映在荷载到达节点的时间上,通过对一简支梁的有限元模拟分析和理论分析结果对比,验证该简化方法的有效性和稳定性.并将该方法用于一座实际连续箱梁桥的动载试验模拟,模拟计算得到的频率及不同车速跑车情况下的动挠度曲线与试验结果吻合.模拟计算可得到冲击系数随车速的变化以及动应变等更多信息,为采用动载试验数据进行桥梁评估提供了更多途径.
By taking a linear triangle load represent vehicle and by putting such dynamic load on differ- ent node according to the vehicle speed, its movement on bridge were simulated. By comparing the simulating result to analytic equation result of a single supported beam, the simplified method is proved to be valid and stable. Associated with the dynamic load test of a continuous beam bridge, the frequency and dynamic deformation of middle span medium-section varied with the vehicle location is fixed with the result of load test. And the method is proved to be feasible once more. According to the result of simulation and dynamic load test, the impact coefficient is proved to relating with speed. The simulation of dynamic load test can provide more information such as the dynamic strain and force, which provide more resources to assess bridge through dynamic load test.
出处
《武汉理工大学学报（交通科学与工程版）》
2013年第2期250-253,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
江苏省交通科学研究计划项目资助(批准号:06Y21)
关键词
连续梁桥
动载试验
冲击系数
动挠度
桥梁评估
continuous beam bridge
dynamic load test
compact coefficient
dynamic deformation
bridge assessment
