| 冰击荷载作用下高速车辆-轨道-桥梁系统耦合振动分析 |
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| 引用本文： | 李鹏浩,李忠龙,朱胜阳,牛津,娄会彬.冰击荷载作用下高速车辆-轨道-桥梁系统耦合振动分析[J].中国公路学报,2021,34(4):187-197. |
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| 作者姓名： | 李鹏浩 李忠龙 朱胜阳 牛津 娄会彬 |
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| 作者单位： | 1. 兰州交通大学机电工程学院, 甘肃兰州 730070;2. 哈尔滨工业大学交通科学与工程学院, 黑龙江哈尔滨 150090;3. 西南交通大学牵引动力国家重点实验室, 四川成都 610031;4. 中铁第四勘察设计院集团有限公司, 湖北武汉 430063 |
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| 基金项目： | 国家自然科学基金项目（51778194，51978587，11790283） |
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| 摘 要： | 为了探明流冰撞击桥墩对高速车辆-轨道-桥梁耦合系统动力学行为的影响，采用精细化有限元模型模拟了流冰撞击桥墩的过程，计算获得了不同冰排特性下流冰撞击力时程曲线，基于列车-轨道-桥梁动力相互作用理论，以流冰荷载作为外激励，建立了高速车辆-轨道-桥梁-冰击动力学分析模型。以5跨32 m简支梁为例，通过研究不同冰击荷载作用下桥梁结构的动力学响应，得到了对桥梁结构影响最大的冰击荷载，分析了在该冰击荷载作用下桥梁子系统和车辆子系统的动力学响应，最后探讨了冰击荷载对桥上列车走行性的影响。结果表明：在冰击荷载作用下，冰排厚度、流冰撞击速度和冰排抗压强度是影响桥梁动力学响应的关键参数，桥梁跨中和墩顶横向位移与加速度随冰排厚度和抗压强度的增加而增大，且随流冰撞击速度的增加呈先增大后减小趋势；流冰撞击桥墩对车辆-轨道-桥梁系统动力学响应影响显著，在冰击荷载作用下主梁横向位移和加速度增幅较大，跨中横向加速度主频与桥梁横向自振频率接近，表明流冰撞击可能会加剧桥梁横向自振频率附近的振动；车体横向振动加速度、脱轨系数、轮轨横向力和轮重减载率在流冰撞击作用下均明显增大，增幅超过2倍，可见流冰撞击对高速列车行车安全性和乘坐舒适性有较大影响。
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| 关 键 词： | 桥梁工程 冰击-车辆-轨道-桥梁系统 数值仿真 铁路桥梁 行车安全 |
| 收稿时间： | 2020-06-01 |
Coupled Vibration Analysis of High-speed Vehicle-track-bridge System Subjected to Floating Ice Collision |
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| LI Peng-hao,LI Zhong-long,ZHU Sheng-yang,NIU Jin,LOU Hui-bin.Coupled Vibration Analysis of High-speed Vehicle-track-bridge System Subjected to Floating Ice Collision[J].China Journal of Highway and Transport,2021,34(4):187-197. |
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| Authors: | LI Peng-hao LI Zhong-long ZHU Sheng-yang NIU Jin LOU Hui-bin |
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| Affiliation: | 1. School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;2. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China;3. State Key Lab of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;4. China Railway Siyuan Survey and Design Group Co. Ltd., Wuhan 430063, Hubei, China |
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| Abstract: | To find out the effect of the floating ice hitting bridge piers on the dynamic behavior of high-speed vehicle-track-bridge coupled system. A refined finite element model was used to simulate the process of the floating ice colliding with the bridge pier, and the ice collision loads under different ice sheet characteristics were obtained. Based on the vehicle-track-bridge dynamic interaction theory, a vehicle-track-bridge dynamics model was established that considered the impact of the floating ice. Taking a 5×32 m simply-supported bridge as a case study, the dynamic responses of the bridge structure under different ice collision loads were investigated, and the most unfavorable ice collision loads with the greatest influence on the bridge structure were obtained. Then, the dynamic responses of the bridge subsystem and vehicle subsystem when subjected to the floating ice collision loads were analyzed. Finally, the effects of the ice collision loads on the running safety of the train passing through the bridge were studied. Results showed that the thickness, collision velocity, and compressive strength of the ice sheet were key parameters for the dynamic responses of the bridge subjected to the floating ice collision loads. The lateral displacement and acceleration of the bridge mid-span and pier top increased with increases in the ice sheet thickness and compressive strength, and first increased and then decreased with an increase in the collision velocity. The effect of the ice collision loads on the dynamic response of vehicle-track-bridge system was remarkable. Under the floating ice collision loads, the lateral displacement and acceleration of the bridge subsystem increased significantly, and the main frequency of lateral acceleration in the bridge mid-span was close to the natural frequency of the bridge, which could be the vibration around the lateral natural frequency of the bridge excited by the floating ice collision loads. The lateral vibration acceleration of the car body, derailment factor, wheel rail lateral force, and wheel unloading rate were significantly increased, with rates of increase that were more than double. This indicated that the ice collision loads had significant effects on the running safety and ride comfort of high-speed trains. |
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| Keywords: | bridge engineering ice-vehicle-track-bridge system numerical simulation railway bridge running safety |
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