高速铁路接触网系统地震响应分析

为研究高速铁路接触网系统地震响应特性,建立接触网系统4柱3跨有限元模型,计算Ⅳ类第三组场地类别,接触线张力为27、30 k N和33 k N工况下,接触网支柱及接触线在主震方向的地震响应,并与单柱模型计算结果进行对比。结果表明:接触网支柱在基础顶面处垂直线路方向初始弯矩随接触线增加而增加,顺线路方向初始弯矩和底部初始扭矩不受影响;接触网支柱及接触线在主震方向上地震响应随接触线张力增加而减小,在低频成分突出的地震作用中接触线张力影响效果比较明显;接触网系统柱线模型支柱地震响应远高单柱模型,建议接触网抗震设计中应充分考虑整体效应。

Analysis of Seismic Response of High-speed Railway Catenary System

A finite element model with four posts and three spans is constructed to study the seismic response characteristics of the high-speed railway catenary system. The seismic responses of the catenary mast and contact wire in the main shock direction subject to 27,30 and 33 k N contact wire tension are calculated respectively in the case of class Ⅳ third group site classification. The results are compared with that of the single column model. The results show that the initial bending moment of the catenary mast in the direction perpendicular to the line on the base surface increases with the increasing contact wire length,while the initial bending moment along the line and the initial torque at the bottom are not affected; the seismic responses of the catenary mast and contact wire in the main shock direction decrease with the increasing contact wire tension; the contact wire tension has great influence in case of the earthquake with low-frequency domination. The seismic response of the column-wire model is much greater than that of the single column model. It is suggested that the overall effect be considered in the seismic design of catenary system.