简支梁车桥耦合振动及其影响因素  

Vehicle-bridge coupled vibration and its influencing factors of simple beam

作　　者：蒋培文[1] 贺拴海[1] 宋一凡[1] 王凌波[1] 周勇军[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2013年第1期59-66,共8页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51008028);交通运输部西部交通建设科技项目(2008 318 812 32)

摘　　要：针对主梁刚度下降对车桥耦合振动响应的影响问题,提出基于ANSYS单一环境下的车桥耦合振动响应数值分析方法。将桥梁与车辆模型独立建于ANSYS环境下,并通过APDL编程语言实现耦合关系,得到振动时程响应曲线,与相关文献对比验证其正确性;并利用该算法研究了当车辆行驶速度、刚度下降段长度、刚度下降比例变化时简支梁桥的车桥耦合振动特性,给出了冲击系数、加速度峰值等参数的三维变化曲面图,分析各参数对车辆过桥时的耦合振动影响。研究结果表明:该算法与传统算法相差小于1%;当简支梁主梁刚度下降时,跨中挠度冲击系数最大值为0.168,跨中弯矩冲击系数最大值为0.239,车辆竖向加速度最大值为0.973,跨中截面竖向加速度最大值为1.354;并且以上参数受到车辆行驶速度的影响程度较大,受主梁刚度降低的影响较小。Aimed at the influence of girder stiffness decline on vehicle-bridge coupled vibration, a vehicle-bridge coupled vibration numerical analysis method was presented based on ANSYS. The bridge and vehicle model were established separately and APDL language was used to realize coupled vibration relationship between them to get the vibration time-history response curve. Through the comparison with some references, the correctness of this method was proved. The arithmetic was used to analyze the response of vehicle-bridge coupled vibration with the change of vehicle speed, stiffness decline length and stiffness degradation ratio. The 3D change curved fig- ures of impact factor and peak acceleration were got and the influence of each parameter on vehi- cle-bridge coupled vibration was analyzed. The results show that the deviation of the new method is less than 1~/40 compared with the traditional one. When the stiffness of main girder decline, the maximum deflection impact coefficient is 0. 168, while the moment is 0. 239. Meanwhile, the maximum vehicle vertical acceleration is 0. 973 and the one in midspan section is 1. 354. The pa- rameters of vehicle-bridge coupled vibration of simply supported beam will be influenced greatly by driving speed, but little by girder stiffness decline. 2 tabs, 14 figs, 15 refs.

关 键 词：桥梁工程 车桥耦合振动 数值分析 三维变化曲面图 主梁刚度下降 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]