| 风、列车作用下大跨度斜拉桥索-梁相关振动研究 |
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| 引用本文： | 王涛,刘德贵,黄辉.风、列车作用下大跨度斜拉桥索-梁相关振动研究[J].中国公路学报,2021,34(4):105-118. |
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| 作者姓名： | 王涛 刘德贵 黄辉 |
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| 作者单位： | 西南科技大学土木工程与建筑学院, 四川绵阳 621000 |
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| 基金项目： | 国家自然科学基金项目（51708468） |
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| 摘 要： | 为了研究大跨度铁路斜拉桥在随机风、列车动力作用下索-梁相关振动导致的拉索振动状态，开发三维空间非线性有限元动力计算程序、列车动力学模型、风场模拟算法，以实际斜拉桥为研究对象，建立全桥三维有限元计算模型进行详细的计算分析。首先，分别使用拉索不分段与分段的全桥模型进行模态计算，讨论拉索局部振动特性与全桥振动特性之间的关系。然后，计算在简谐外激励作用下斜拉桥全桥的非线性振动时程，对比单根拉索在端部位移激励下的非线性振动特性与全桥结构中拉索发生大幅索-梁相关振动之间的差别，依据非线性振动理论，讨论实际斜拉桥中拉索发生索-梁相关振动的共振条件。最后，使用拉索分段的斜拉桥全桥模型，研究在三维空间中，风场动力作用、列车动力作用、风-列车-桥梁耦合动力作用在各个工况下对斜拉桥全桥索-梁相关振动的影响。研究结果表明：对于大跨度铁路斜拉桥，在实际日常运营状态下，风和列车的作用不会使结构进入非线性振动状态；单独的风或列车动力作用不会使拉索达到索-梁相关振动的共振条件；风-列车-桥梁耦合动力作用下拉索振动相对单独的风、列车作用更为明显，但也不会使拉索达到索-梁相关振动的共振条件。
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| 关 键 词： | 桥梁工程 索-梁相关振动 有限元方法 斜拉索 风-列车-桥梁耦合振动 |
| 收稿时间： | 2020-03-18 |
Investigation of Cable-beam-related Vibration in Long-span Cable-stayed Bridge Based on Wind and Train Effects |
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| WANG Tao,LIU De-gui,HUANG Hui.Investigation of Cable-beam-related Vibration in Long-span Cable-stayed Bridge Based on Wind and Train Effects[J].China Journal of Highway and Transport,2021,34(4):105-118. |
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| Authors: | WANG Tao LIU De-gui HUANG Hui |
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| Affiliation: | School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China |
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| Abstract: | This study investigated the cable vibration caused by cable-beam-related vibration under stochastic wind and train dynamic effects in long-span railway cable-stayed bridges. A three-dimensional space nonlinear dynamic finite element (FE) method program, train dynamics model, and wind field simulation algorithm were developed. Using a real cable-stayed bridge as the research object, a three-dimensional whole bridge FE model was built and analyzed in detail. First, separate bridge models with and without divided cables were used for modal calculations, and the relationship between the local vibration characteristics of the cables and the vibration characteristics of the whole bridge was examined. Second, the nonlinear vibration time history of the cable-stayed bridge under harmonic excitation was investigated. The nonlinear vibration characteristics of a single cable under end-position displacement excitation were compared with the large cable-beam vibration of the entire bridge. The resonance conditions of the cable-beam-related vibration in cable-stayed bridges were investigated based on the nonlinear vibration theory. Finally, the influences of the wind field dynamics, train dynamics, and wind-train-bridge coupling dynamic effects on the cable-beam-related vibration of cable-stayed bridges under various working conditions in three-dimensional space were studied using the cable-stayed bridge FE model with the divided cables. The results of this investigation indicated that for long-span railway cable-stayed bridges, during the actual operation state, the effects of the wind and train will not cause the nonlinear vibration of the structure. Resonance conditions for the cable-beam-related vibration will not be achieved when there is only a wind or train effect on it. Cable vibration was obviously caused by wind-train-bridge coupled vibration effect, but the resonance conditions for the cable-beam-related vibration were not achieved in this case either. |
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| Keywords: | bridge engineering cable-beam related vibration finite element method stayed cable wind-train-bridge coupled vibration |
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