高温环境下列车荷载对CRTSⅡ型板式轨道宽窄接缝损伤行为的影响  

Effect of Train Load on Damage Behavior of Wide and Narrow Joints of CRTSⅡ Slab Track in High Temperature Environment

作　　者：李威[1,2] 刘学毅 肖杰灵[1,2] 刘笑凯[1,2] 董佳佳[1,2] LI Wei;LIU Xue-yi;XIAO Jie-ling;LIU Xiao-kai;DONG Jia-jia(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,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 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2018年第7期32-36,共5页Railway Standard Design

基　　金：国家自然科学基金重点资助项目(U1434208;U1534203);四川省科技计划项目(2016GZ0333);国家自然基金面上项目(51678506)

摘　　要：针对高温环境下CRTSⅡ型板式轨道易受列车荷载作用产生宽窄接缝伤损的问题展开研究,建立有限元模型,分析轮载作用位置、轴重大小以及制动力等列车荷载作用特征与高温环境耦合作用下宽窄接缝损伤行为及发展规律。研究表明:列车荷载与温度耦合作用下宽窄接缝伤损主要发生在宽接缝下部;轴重作用位置会影响宽窄接缝最先出现损伤的位置及发展趋势;轴重会加剧宽窄接缝的损伤程度,当轴重超过5 t时,会使宽窄接缝损伤急剧增大;制动力对宽窄接缝影响与作用位置有关,且当制动力作用于宽窄接缝正上方时对宽窄接缝损伤影响最大。列车荷载对宽窄接缝影响主要体现在改变伤损位置、形态及发展趋势上,且对伤损发展有一定的加剧作用。Aiming at the problem that the CRTS Ⅱ slab track is susceptible to the load of the train to cause the damage of the wide and narrow joints in high temperature environment,this paper establishes a finite element model to analyze the damage behavior and development law of the wide and narrow joints subject to the combination of high temperature environment and train load including train load position,axle load and braking force. The results show that the damages of the wide and narrow joints mainly occur in the lower part of the joints subject to the combination of train load and temperature; the position of the axle load may affect the initial position and development tendency of the wide and narrow joints,and increase the damage degree; the axle load may increase the degree of damage to the wide and narrow joints,and the axle load of more than 5 t may increase dramatically damages to the wide and narrow joints; the impact of the braking force on the width and joints is related to the position of the action,and the greatest impact on the wide and narrow joints takes place when the braking force is applied right above the wide and narrow joints. The impact of train load on the wide and narrow joints is mainly effective in changing the location,shape and development tendency of the damage,and intensifies the damage to a certain degree.

关 键 词：CRTSⅡ型板 宽窄接缝 列车荷载 温度荷载 伤损 

分 类 号：U213.244[交通运输工程—道路与铁道工程]