| 铁路大跨T形刚构桥车桥耦合振动与动力性能 |
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| 引用本文： | 勾红叶,石晓宇,周文,康锐.铁路大跨T形刚构桥车桥耦合振动与动力性能[J].西南交通大学学报,2018,53(4):679-686. |
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| 作者姓名： | 勾红叶 石晓宇 周文 康锐 |
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| 作者单位： | 西南交通大学土木工程学院 |
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| 基金项目： | 中国铁建股份公司科技研究开发计划资助2014-C34中央高校基本科研业务费专项资金资助项目2682015CX078国家自然科学基金资助项目51108382 |
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| 摘 要： | 为探究铁路大跨T形刚构桥车桥耦合振动特性与动力性能，以宜万铁路马水河大桥为工程背景，建立桥梁空间杆系有限元模型以及包含31个自由度的车辆模型，进行车桥耦合振动计算分析.通过动载试验测试桥梁的自振特性，并测试列车以不同速度通过桥跨和以一定速度在特定位置制动时桥跨结构的动应变、动位移以及加速度等动力响应.依据动载试验与车桥耦合振动计算综合分析马水河大桥的动力性能.研究结果表明:车桥耦合振动计算结果与实测结果吻合较好，桥梁结构动力响应满足规范限值，该桥具有良好的横向、竖向刚度与动力性能；实测桥跨结构及墩顶动力系数最大值为1.08，桥梁结构受行车及制动的动力作用不明显；列车的动力响应随车速的提高而增大，但均满足规范限值，具有良好的安全性与平稳性.
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| 关 键 词： | 铁路大跨T形刚构桥 车桥耦合振动 动力响应 自振特性 动载试验 |
| 收稿时间： | 2017-09-19 |
Coupled Train-Bridge Vibration and Dynamic Characteristics of Long-Span T-Shaped Rigid Frame Railway Bridge |
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| GOU Hongye,SHI Xiaoyu,ZHOU Wen,KANG Rui.Coupled Train-Bridge Vibration and Dynamic Characteristics of Long-Span T-Shaped Rigid Frame Railway Bridge[J].Journal of Southwest Jiaotong University,2018,53(4):679-686. |
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| Authors: | GOU Hongye SHI Xiaoyu ZHOU Wen KANG Rui |
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| Abstract: | To study the characteristics of coupled train-bridge vibration and dynamic performance of a long-span T-shaped rigid frame railway bridge, taking the Mashuihe bridge on the Yichang-Wanzhou railway line as an example, a three-dimensional finite element model for coupled train-bridge vibrations was built, and each carriage of a train was modelled by a 31-degrees-of-freedom dynamic system. Field tests were conducted to determine the free vibration characteristics as well as the strain, displacement, and acceleration of the bridge structure under trains moving at different speeds and braking at a specified position from a set speed. Therefore, the dynamic responses of the Mashuihe bridge was studied comprehensively, both numerically and experimentally. The calculated results were in good agreement with the corresponding experimental results. The dynamic responses of the bridge satisfied the requirements of the code, and the bridge exhibited good lateral and vertical stiffness. The dynamic coefficients of the mid-span and the top of the pier was 1.08, which indicates that the impact of train braking has little effect on the bridge structure. The dynamic responses of the carriages increased with increasing speed, but also satisfied the requirements of the code. The carriages exhibited satisfactory safety and stability. |
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