城市轨道交通简支箱梁桥结构振动特性分析

发布时间：2018-08-18 09:24

【摘要】：研究目的:针对列车过桥时简支箱梁桥所发生的结构振动问题,本文总结分析以往利用SIMPACK软件建立的仿真模型,并基于多体动力学与有限元法,提出一种轮轨耦合仿真实现方法,据此建立城市轨道交通车桥耦合振动分析模型,进而从时域和频域两个方面对列车过桥时箱梁结构振动特性进行分析,以期为城轨高架箱梁桥的减振设计提供参考。研究结论:(1)列车以40 km/h的速度过桥时,箱梁翼板的竖向振动最强烈,其次为腹板,且箱梁的竖向振动较之横向振动更为剧烈;(2)列车速度增加不仅会增大箱梁的变形,也会使箱梁受到更大的冲击能量;(3)列车低速过桥时,40 Hz以下的低频模态对箱梁局部振动贡献较大;高速过桥时,基频模态对箱梁局部振动贡献最大,且车速增加容易激发箱梁更高阶的模态,致使箱梁局部振动加强;(4)本文轮轨耦合方法不仅适用车桥间的耦合,也适用于车辆与大地或其他轨道结构间的耦合。
[Abstract]:The purpose of this paper is to analyze the structural vibration of simply supported box-girder bridge during train crossing. The simulation model established by SIMPACK software is summarized and analyzed in this paper, based on multi-body dynamics and finite element method. A wheel-rail coupling simulation method is proposed, based on which the coupled vibration analysis model of the vehicle-bridge of urban rail transit is established, and the vibration characteristics of the box girder structure when the train crosses the bridge are analyzed from two aspects: time domain and frequency domain. In order to provide reference for the design of vibration absorption of urban rail viaduct box girder bridge. The conclusions are as follows: (1) when the train crosses the bridge at a speed of 40 km/h, the vertical vibration of the wing plate of the box girder is the strongest, followed by the web plate, and the vertical vibration of the box girder is more intense than that of the transverse vibration; (2) the increase of the train speed will not only increase the deformation of the box girder, (3) the low frequency mode below 40 Hz is the most important contribution to the local vibration of the box girder, and the fundamental frequency mode contributes most to the local vibration of the box girder when crossing the bridge at a high speed. With the increase of vehicle speed, the local vibration of the box girder is strengthened. (4) the wheel-rail coupling method is suitable not only for the coupling between the vehicle and the bridge, but also for the coupling between the vehicle and the earth or other track structures.
【作者单位】：华东交通大学铁路环境振动与噪声教育部工程研究中心;
【基金】：国家自然科学基金项目(51478184,51268015)
【分类号】：U441.3

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