桥上CRTS Ⅱ型板式无砟轨道参数对轨道结构振动响应的影响  

Study on the impact of track parameters on the CRTS Ⅱ slab track structure vibration characteristics on bridges

作　　者：房建[1] 杨敏超 雷晓燕[1] 练松良[2] FANG Jian;YANG Minchao;LEI Xiaoyan;LIAN Songliang(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《铁道科学与工程学报》2022年第8期2125-2132,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51668019);江西省教育厅科研项目(GJJ180297)。

摘　　要：列车荷载作用下,轨道结构振动损坏与轨道结构参数关系密切,为研究桥上CRTS Ⅱ型板式无砟轨道结构参数对轨道振动的影响,基于高速列车-CRTSⅡ型板式无砟轨道-桥梁耦合振动有限元分析模型,从时、频域对比分析轨道参数对桥上CRTSⅡ板式轨道振动特性的影响。研究结果表明:增大钢轨质量与惯性矩可降低轮轨力,采用重型钢轨可降低钢轨振动水平,对降低轮轨噪声具有一定积极意义。钢轨振动水平在1~40 Hz范围内随扣件刚度的增加而减小;但在40~100 Hz范围内,钢轨的振动水平随着扣件刚度增加而略微增大。在40~100 Hz范围内减小扣件的刚度可以减小轨道板、桥梁的振动水平,减振效果随着垫板刚度的减小而增大。随着轨道板厚度增大,钢轨振级在60~250 Hz频率范围内呈减小趋势,在2.5~60 Hz范围内呈增大趋势;轨道板的振级在60 Hz以上的频率范围内随轨道板厚度的增大而减小;桥梁的振级在20 Hz以上的频率范围内随轨道板厚度的增大而减小。Under the vehicle’s dynamic loads,the damage from track structure vibration has close ties with track structural parameters.In this paper,by using high-speed vehicle-track-bridge coupled finite-element analytic model,the influences of CRTSⅡ track structural parameters on track structure vibration was analyzed in time-and frequency-domains.The results showed that with the increase of rail mass and rail inertia moment,the wheel-rail interaction force can be reduced,hence using heavy rail can reduce the level of rail vibration and it is meaningful for decreasing wheel-rail noise.The vibration level of rail reduces with the increase of supporting slab stiffness in the frequency range of 1~40 Hz;however,in the range of 40~100 Hz,the vibration level of rail rises with the increase of supporting slab stiffness.In the range of 40~100 Hz,the vibration level of track slab and bridge decreases with the decrease of supporting slab stiffness and the effect of vibration reduction is improved.With the increase of slab thickness in the frequency range of 60~250 Hz,the vibration level of rail decreases and then increases in the frequency range of 2.5~60 Hz.With the increase of track slab thickness in the range of above 60 Hz,the vibration level of track slab decreases;and it increases in the frequency range of 2.5~60 Hz.The vibration level of bridge decreases with the increase of track slab thickness in the range of above 20 Hz.

关 键 词：CRTSⅡ型板式无砟轨道 实测轨道不平顺激励 轨道结构振动 轨道结构参数 

分 类 号：U213.2[交通运输工程—道路与铁道工程]