温升荷载下带裂工作的纵连板轨道温度力研究  

Study of longitudinal temperature pressure of longitudinal ballastless track with cracks

作　　者：刘笑凯[1,2] 李威 肖杰灵[1,2] 刘学毅 全毅[1,2] LIU Xiaokai;LI Wei;XIAO Jieling;LIU Xueyi;QUAN Yi(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,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《中南大学学报（自然科学版）》2018年第10期2526-2532,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(U1434208;U1534203;51678506);四川省科技计划项目(2016GZ0333)~~

摘　　要：针对带裂工作的纵连板式轨道,研究温升荷载作用下板内温度力的分布规律及其影响因素。根据结构温度力计算理论,推导带裂工作的纵连板式无砟轨道在温升荷载下的温度压力计算公式,并结合试验,分析不同板底约束、配筋率和轨道板混凝土弹性模量条件下裂纹对轨道纵向温度压力的影响。研究结果表明:裂纹对纵连式无砟轨道的纵向温度压力影响较大,在计算时应当考虑裂纹对纵向温度压力的影响;摩阻系数对轨道板的纵向力影响较小,计算时可不考虑;板底黏结力对轨道板纵向温度压力影响较大,板底黏结力的增加会大幅度增加裂纹闭合所需的升温值并减少因裂纹而损失的温度;配筋率越高,轨道板的纵向温度压力越高,轨道板释放的温度压力越小,但配筋率对轨道板的纵向温度压力的影响较小。板底黏结状态和轨道板配筋率应当作为计算轨道板温度压力的重要参数。With consideration of the longitudinal temperature pressure characteristics of longitudinal ballastless track with crack,formula of longitudinal temperature pressure of longitudinal ballastless track with crack was deduced.Through the experiment,effects of different slab bottom constraints,reinforcement ratio and elastic modulus of slab on the longitudinal temperature pressure of track were analyzed.The results show that the influence of the crack on the longitudinal temperature pressure of the longitudinal ballastless track is large,and the influence of the crack on the longitudinal temperature pressure should be taken into account in the calculation.The friction coefficient has little effect on the longitudinal force of slab,and it is not considered in calculating.The bond force has a large effect on the longitudinal temperature pressure of slab.The increase in the bond force at the bottom of slab leads to a big rise in the temperature which is required for the crack closure and reduces the temperature pressure loss caused by cracking.To a small extent,the higher the reinforcement ratio is,the higher the longitudinal temperature of the track plate is and the smaller the temperature pressure released by the track plate becomes.State and of slab bottom and reinforcement ratio of slab should be used as important parameters for calculating the temperature pressure of slab.

关 键 词：纵连式无砟轨道 裂纹 温度压力 温升荷载 

分 类 号：U213.244[交通运输工程—道路与铁道工程]