市域高架铁路不同轨道结构的特征频率及弹性不平顺对比研究  

A comparative study on characteristic frequency and elastic roughness of different tracks on elevated urban rail transit

作　　者：杜运国 苟长飞 史吏 陈致远 姜建伟 DU Yunguo;GOU Changfei;SHI Li;CHEN Zhiyuan;JIANG Jianwei(Wenzhou Mass Transit Railway Investment Group Co.,Ltd.,Wenzhou 325000,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]温州市铁路与轨道交通投资集团有限公司,浙江温州325000 [2]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2020年第6期633-639,669,共8页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(51608482;51879234);温州市铁路与轨道交通投资集团有限公司课题(TT-FZB-S1-QT-16017)。

摘　　要：针对双块式无砟普通道床、橡胶垫减振道床和钢弹簧浮置板道床等3种城市高架轨道结构,建立了3层叠合梁轨道结构模型,并引入Hertz线性接触实现了列车轮对和轨道结构的动力耦合,分析了3种轨道结构的特征频率,并特别提供了3种轨道结构的弹性高低不平顺谱。结果表明:橡胶垫减振道床和钢弹簧浮置板道床能有效滤去高于轨道板与板下弹性层(橡胶垫或钢弹簧)共振频率的振动分量;虽然钢弹簧浮置板道床的隔振效果最优,但其弹性不平顺幅值最高,约为其余2种道床的3.5倍。A three-beam unit is established for modeling three types of subway tracks used on elevated rail transit,namely the double-block ballastless track,the rubber-pad floating slab track,and the steel-spring floating slab track.Moreover,linearized Hertz contact is introduced for the coupling solution of wheelset and railway track.The characteristic frequencies of the three railway tracks are obtained and compared.Particularly,the spectrums of elastic roughness of the three tracks are presented.It is found that the rubber-pad floating slab track and the steel-spring floating slab track can effectively filter out the vibration components higher than the resonance frequency of the track plate and the elastic layer under the plate.The steel-spring floating slab track has the highest vibration-isolation efficiency but the highest roughness amplitude,which is about 3.5 times the roughness of the remaining two tracks.

关 键 词：无砟普通轨道 橡胶垫减振道床 钢弹簧浮置板道床 特征频率 弹性不平顺 

分 类 号：U213.2[交通运输工程—道路与铁道工程]