无缝线路钢轨局部温变对纵向力学特性影响  

Influence of Local Temperature Change on Longitudinal Mechanical Characteristics of Continuously Welded Rail Track

作　　者：霍新伟 耿浩[1] 朱禹[1] HUO Xinwei;GENG Hao;ZHU Yu(Key Laboratory of High-speed Railway Engineering of Ministry of Education, Southwest Jiaotong University,Chengdu 610031,China)

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：《路基工程》2018年第6期31-34,共4页Subgrade Engineering

基　　金：国家自然科学基金(U1434208)

摘　　要：为了研究无缝线路钢轨局部温度变化对钢轨纵向力学特性的影响,基于有限元分析软件ANSYS建立了无缝线路钢轨局部温度变化的力学分析模型,研究无缝线路钢轨局部降温后,以及局部降温后再次升温的纵向应力重分布和纵向位移的变化。结果表明:钢轨局部降温能够有效放散温度力,但钢轨降温区段会产生纵向收缩位移;钢轨局部降温再升温过程会导致钢轨爬行,积累钢轨纵向应力,使其不再均匀分布。To study the effect of local temperature change on the longitudinal mechanical characteristics of continuously welded rail track,the model for such mechanical analysis was established depending on the finite element analysis software ANSYS,and then the changes of both the longitudinal stress redistribution and the longitudinal displacement after local temperature drop and local temperature rise once more after the temperature drop occurring at the rail track,were studied.The results show that,the local temperature drop of rail track may relieve the temperature stress,but lead to longitudinal shrinkage displacement therein;and the local temperature rise after temperature drop may cause track creeping and longitudinal stress accumulation therein,leading to uneven distribution of rail track.

关 键 词：无缝线路 温度 纵向应力 

分 类 号：U213.212[交通运输工程—道路与铁道工程]