| 考虑轴距轴数的BRT桥梁跨中动挠度的仿真分析 |
| |
| 引用本文： | 吴奇伦,,薛艳霞,苏振超.考虑轴距轴数的BRT桥梁跨中动挠度的仿真分析[J].厦门理工学院学报,2021,29(1):73-78. |
| |
| 作者姓名： | 吴奇伦 薛艳霞 苏振超 |
| |
| 作者单位： | 1厦门大学嘉庚学院土木工程学院，福建 漳州 363105；
2厦门大学土木建筑学院，福建 厦门 361005 |
| |
| 摘 要： | 为更好地模拟快速公交系统（BRT）中桥梁的变形规律，基于Midas Civil软件设计出考虑车辆轴距轴数影响的三轴移动荷载模型，并以BRT中一段桥梁为例，计算出系统的固有频率和模态，将客车简化为单轴和三轴移动荷载模型，模拟仿真桥梁跨中动挠度。不同工况下的仿真结果表明:两种模型所求得的跨中最大动挠度存在较大差异。相比于三轴移动模型，单轴移动模型所得的最大动挠度较大，最大动挠度出现的时刻较早，振动时长较短，且幅值差异较大；当移动荷载的时速在10~60 km·h-1时，时速对跨中最大动挠度的影响不大，单轴模型的最大挠度较三轴模型大，偏差约在20%~25%之间。建议在模拟长轴距或多轴车辆时，应充分考虑轴距和轴数的影响，宜采用多段三角冲击荷载进行模拟
|
| 关 键 词： | 快速公交系统（BRT）桥梁 跨中动挠度 车桥耦合振动 移动荷载 时程分析 Midas Civil分析模型 |
Simulation Analysis of Mid span Dynamic Deflection of
BRT Bridge Considering Wheelbase and Number of Axes |
| |
| WU Qilun,,XUE Yanxia,SU Zhenchao.Simulation Analysis of Mid span Dynamic Deflection of
BRT Bridge Considering Wheelbase and Number of Axes[J].Journal of Xiamen University of Technology,2021,29(1):73-78. |
| |
| Authors: | WU Qilun XUE Yanxia SU Zhenchao |
| |
| Affiliation: | 1.School of Civil Engineering,Tan Kah Kee College,Xiamen University，Zhangzhou 363105,China；
2.School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China |
| |
| Abstract: | To simulate the deformation pattern of the bridge in the bus rapid transit system (BRT) well,a three axis moving load model considering the influence of vehicle wheelbase and axle number was designed based on Midas Civil software,and the natural frequency and mode of the system calculated taking a BRT bridge as an example.The bus was simplified into uniaxial and triaxial moving load models,simulating the mid span dynamic deflection of the bridge.The simulation results under different working conditions show that the maximum mid span dynamic deflection obtained from a triaxial moving model and a uniaxial motion model is quite different.The uniaxial motion model has larger maximum dynamic deflection which comes earlier and has shorter vibration duration as well as large amplitude difference.When the speed of the moving load is in the range of 10-60 km·h-1,the speed has little effect on the mid span maximum dynamic deflection.The deviation of the maximum deflection of the uniaxial model is about 20%-25%.It is suggested that the influence of wheelbase and number of axles should be fully considered when simulating long wheelbase or multiaxle vehicle,and multi stage triangular impact load should be adopted for simulation. |
| |
| Keywords: | BRT bridgemid span dynamic deflectionvehicle bridge coupling vibrationmoving loadtime history analysisMidas Civil analysis model |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《厦门理工学院学报》浏览原始摘要信息 |
|
点击此处可从《厦门理工学院学报》下载全文 |
