城市轨道交通“公轨合一”型高架桥车桥耦合振动分析

发布时间：2018-01-29 19:10

本文关键词： 公轨合一汽车-列车-桥梁耦合列车平稳性轨道不平顺结构设计　出处：《工程力学》2016年02期 　论文类型：期刊论文

【摘要】：对某"公轨合一"型高架桥进行了汽车-列车-桥梁耦合振动分析。利用薄板单元和梁单元建立了桥梁的有限元模型,推导了17自由度可以考虑列车车体空间效应的整车垂向模型,引入轨道不平顺因素,轮轨关系假定为密贴,列车-桥梁耦合系统采用分离迭代法求解,利用ANSYS平台和自主编制的FORTRAN计算程序实现,汽车荷载采用移动常力模型,分析了不同工况下车桥子系统之间的影响,同时还讨论了轨道不平顺因素对该车桥耦合系统的影响。结果表明:该文所研究桥梁模型的上部公路部分和下部轨道部分各自通行车辆荷载时相互之间的影响很小,作者认为在做该桥梁的强度设计时,可以忽略上下部分的耦合影响;同时,对于该文模型,当列车车速为低速时(60 km/h),轨道不平顺因素对于桥梁跨中位移的影响很小,因而在做桥梁强度设计时,列车荷载可按轴荷取值而忽略轨道不平顺带来的动态效应。该结论可供同类桥梁设计时作为参考。
[Abstract]:The vehicle-train-bridge coupling vibration analysis is carried out for a "public rail in one" viaduct, and the finite element model of the bridge is established by using thin plate element and beam element. The vertical model with 17 degrees of freedom which can take into account the space effect of train body is derived. The track irregularity factor is introduced and the wheel-rail relationship is assumed to be closely pasted. The train bridge coupling system is solved by separate iteration method. Based on the ANSYS platform and the self-compiled FORTRAN program, the influence of the vehicle-bridge subsystem under different working conditions is analyzed by using the moving force model of the vehicle load. The influence of track irregularity on the vehicle-bridge coupling system is also discussed. The results show that:. In this paper, the upper highway part and the lower track part of the bridge model have little influence on each other when the vehicle loads on each other. The author thinks that the coupling effect of the upper and lower parts can be neglected in the strength design of the bridge. At the same time, for the model, when the train speed is 60 km / h, the influence of track irregularity on the bridge span displacement is very small, so the bridge strength design is done. The dynamic effect caused by track irregularity can be neglected according to the axial load, which can be used as a reference in the design of similar bridges.
【作者单位】：武汉理工大学土木工程与建筑学院;
【基金】：国家自然科学基金面上项目(51178365)
【分类号】：U441.3;U448.121
【正文快照】： 轨道交通以其运量大、高速便捷、能耗低、环境污染小等优点,在世界范围内得到了快速发展。近年来,我国各大城市掀起了城市轨道交通的建设热潮。在建设大潮中,出现了一种新型的“公轨合一”型高架桥。该桥梁的设计旨在充分利用交通线路、提高土地利用率,将城市轨道交通地上线路

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