桥梁参数对桥上无缝线路伸缩力的影响分析  

Analysis on How Bridge Parameters Affect the Expansion and Contraction Force of Continuous Welded Rail on Bridge

作　　者：蔡敦锦 颜乐[1] 李悦[1] 宋彦辰 王平[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《铁道标准设计》2014年第7期30-34,共5页Railway Standard Design

基　　金：中央高校基本科研业务费专项资金资助项目(编号:2682013CX043)

摘　　要：基于有限单元法和梁轨相互作用理论,以铁路常见桥型连续梁桥和简支梁桥为例,建立了线-桥-墩一体化桥上无缝线路计算模型,分析了伸缩力的作用规律及桥梁跨数、支座、墩台纵向水平刚度、桥梁跨度对伸缩力的影响。结果表明:宜增大连续梁相邻简支梁桥墩的纵向水平刚度,以提高其承载能力;对于多达数十跨、数百跨的简支梁,可只取10跨计算;对于多联连续梁桥,可只取相邻5跨简支梁进行计算;我国桥上无缝线路计算中一般未考虑活动支座摩擦系数的影响及将支座视为刚性体,都是偏于安全的;桥梁墩台纵向水平刚度不宜过大。In this study, based on the finite element method and the theory of interaction between girder and rail, the commonly used bridge types, which include continuous girder bridges and simply-supported girder bridges, were cited as the examples. Subsequently, an integrated track-bridge-piers calculation model of continuous welded rail on bridge was established; the expansion and contraction force characteristics was analyzed; and the influences upon the expansion and contraction force caused by the number of bridge spans, by bridge bearing, by longitudinal horizontal rigidity of pier and abutment, and by bridge span length, were researched. The result shows that： （a） It is necessary to increase the longitudinal horizontal rigidity of the pier of the simply-supported girder adjacent to the continuous girder of the bridge, so as to increase this pier＇s bearing capacity. （b） The simply-supported girder bridge, which is made of tens to hundreds of spans, can be calculated by only taking its ten spans. （c） The multi-unit continuous girder bridge can be calculated by only taking five adjacent simply-supported girders. （d） In China, the continuous welded rail on bridge is calculated generally without considering the effect of friction coefficient of movable bearing and the bearing is regarded as a rigid body. Those practices are on the safe side. （e） The longitudinal horizontal rigidity of bridge pier and abutment should not be designed too large.

关 键 词：桥上无缝线路 伸缩力 桥梁跨数 墩台刚度 桥梁跨度 

分 类 号：U213.9[交通运输工程—道路与铁道工程]