直逆向过岔列车与桥上道岔耦合振动影响因素分析  

Analysis of influence of some factors on train-turnout on bridge coupling vibration with train running in main direction

作　　者：曾志平[1] 陈秀方[1] 余志武[1] 赵国藩[2] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《中南大学学报（自然科学版）》2008年第4期856-861,共6页Journal of Central South University:Science and Technology

基　　金：铁道部科技开发计划项目(2004G05-A)

摘　　要：针对桥上无缝道岔,运用有限单元法,建立钢轨-岔枕-桥梁弹簧-阻尼空间振动模型;运用弹性系统动力学总势能不变值原理及形成矩阵的"对号入座"法则建立列车-道岔-桥梁空间振动方程组;以温福客运专线田螺大桥为例,拟定桥上铺设了由2组38号道岔组成的单渡线,分析直逆向过岔时,列车运行速度、轨下垂向刚度、枕下垂向均布刚度、岔区垂向不平顺幅值及梁体高度等参数对列车-道岔-桥梁系统耦合振动的影响。研究结果表明:系统响应随列车速度和岔区垂向不平顺幅值增大、梁体高度减小而增加;轨下垂向刚度对系统不同的响应有不同的影响;道岔响应随枕下垂向均布刚度增大而降低。Aimed at seamless turnout on bridge, the rail-turnout tie-bridge spring-damping vibration model was built by using finite element method. The train-turnout-bridge spatial vibration equation sets were formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the ＂set-in-right-position＂ rule for formulating matrixes. Taking Tian-luo major bridge in Wenzhou--Fuzhou railway line for passenger as an example, it was assured that there was a crossover combined with two No.38 turnouts on the bridge. The influences of some factors on the train-turnout-bridge system coupling vibration with train running in the main direction were analyzed, such as train velocity, the vertical stiffness under rail, the vertical uniform stiffness under tie, the amplitude of vertical irregularity in turnout area, the height of beam and so on. The results show that the system responses increase with the increase of train velocity, the increase of the amplitude of vertical irregularity in turnout and the decrease of the height of beam. The vertical stiffness under rail has different influences on different responses of the system. Turnout responses decrease with the increase of the vertical uniform stiffness under tie.

关 键 词：桥上无缝道岔 列车 直向过岔 振动 

分 类 号：U211.3[交通运输工程—道路与铁道工程]