| 混编货车通过中小跨度桥梁时车桥振动分析 |
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| 引用本文： | 李奇,吴定俊,李俊.混编货车通过中小跨度桥梁时车桥振动分析[J].同济大学学报(自然科学版),2007,35(2):171-175. |
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| 作者姓名： | 李奇 吴定俊 李俊 |
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| 作者单位： | 同济大学,桥梁工程系,上海,200092 |
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| 摘 要： | 运用基于蠕滑理论的车桥耦合振动空间分析程序，分析了混编货车通过铁路上标准32m跨径预应力混凝土简支梁时的车桥振动特征．从列车在不同加载位置对桥梁的作用以及桥梁对车辆的反作用的角度出发，结合车桥的动力特性，揭示了混编货车过桥时，一般桥梁振动响应较大、轻车容易发生脱轨事故的机理——混编货车由于轴重差别显著，对桥梁产生周期性的大幅值的强迫荷载，导致桥梁振动剧烈，而桥梁的振动加剧又对轻车产生强烈的反作用．
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| 关 键 词： | 桥梁振动 车桥耦合振动 混编货车 提速 蠕滑理论 脱轨 |
| 文章编号： | 0253-374X（2007）02-0171-05 |
| 修稿时间： | 2005-05-18 |
Train-Bridge Vibration Analysis of Mix-Marshalling Freight Trains' Traversing Medium and Small Span Bridges |
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| LI Qi,WU Dingjun,LI Jun.Train-Bridge Vibration Analysis of Mix-Marshalling Freight Trains'''' Traversing Medium and Small Span Bridges[J].Journal of Tongji University(Natural Science),2007,35(2):171-175. |
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| Authors: | LI Qi WU Dingjun LI Jun |
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| Institution: | Department of Bridge Engineering, Tortgji University, Shanghai 200092, China |
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| Abstract: | A program for spatial analysis of train-bridge coupling vibration is developed on the basis of wheel-rail contact creep theory. The train-bridge vibration characteristic is analyzed by this program when mix-marshalling freight trains traverse a 32 -meter-span prestressed concrete simple beam bridge. The mechanism that dynamic responses of bridges are prominent and the empty trains are inclined to derailment is derived from the dynamic responses anlysis when vehicles are at different loading location. That is, periodic large amplitude forced load is caused by the significant difference of axle load of mix-marshalling freight trains, which results in severe vibration of bridges; on the other hand, severe vibration of bridges produces intensive counteraction to empty trains. |
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| Keywords: | bridge vibration train-bridge coupling vibration mix-marshalling freight trains speedraising creep theory derailment |
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