桥上纵连板式无砟轨道无缝道岔力学特性  

Mechanical Properties of Continuous-Slab-Track Welded Turnout on Bridge

作　　者：乔神路[1] 高亮[1] 曲村[1] 辛涛[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《西南交通大学学报》2010年第5期669-675,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(50878018);国家863计划资助项目(2007AA11Z129);铁道部科技研究开发计划资助项目(2008G031-I)

摘　　要：为研究桥上纵连板式无砟轨道无缝道岔的力学特性,根据桥上纵连板式无砟轨道无缝道岔的特点,采用有限元方法,建立桥上纵连板式无砟轨道无缝道岔的纵-横-垂向空间耦合计算模型.以铺设在桥上的客运专线18号无砟轨道无缝单渡线为例,研究轨道板/底座板伸缩刚度、摩擦板长度、桥梁形式对桥上纵连板式无砟轨道无缝道岔力学特性的影响.结果表明:减小轨道板/底座板伸缩刚度,对轨道结构变形影响较小,但下部结构受力明显降低,最大降幅约为90%;增加摩擦板长度,有利于控制桥上无缝道岔的受力与变形,可减小下部结构受力,当摩擦板长度由50 m增至100 m时,端刺受力可减小约18%;桥上纵连板式无砟轨道无缝道岔宜铺设在连续梁上.In order to study the mechanical properties of longitudinal connected ballastless welded turnouts on bridges,a longitudinal-transverse-vertical spatial coupling model was established according to the characteristics of the turnouts using finite element method.Taking the single crossover of No.18 welded turnout for ballastless track laid on a bridge in passenger dedicated line as an example,the influences of some main factors,including stiffness of track plate/seating plate,length of friction plate,and bridge type,on the mechanical properties of the longitudinal connected ballastless welded turnout on bridges were analyzed.The computational results show that the reduction of stiffness of track plate/seating plate has little effect on the force and deformation of the track structure,but is favorable for the force of substructure,with the largest reduction of about 90%;lengthening the friction plate is helpful for controlling the force and deformation of the turnout,and can also decrease the force of substructure（for instance,the force acted on the end thorn was decreased by about 18% when the friction plate was lengthened from 50 to 100 m）;and the longitudinal connected ballastless welded turnout should be laid on the continuous bridge.

关 键 词：桥上无缝道岔 纵连板式无砟轨道 力学特性 影响因素 

分 类 号：U213.6[交通运输工程—道路与铁道工程]