混凝土-CA砂浆复合试件界面端奇异应力场消除方法研究  

Research on eliminating the stress singularity at interfacial edge of concrete-CA mortar composite specimens

作　　者：曹世豪[1] 李佳莉[1] 康维新 刘学毅[1] CAO Shihao;LI Jiali;KANG Weixin;LIU Xueyi(MOE Key Laboratory of High-speed Railway 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

出　　处：《铁道科学与工程学报》2018年第9期2232-2239,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金重点资助项目(U1434208)

摘　　要：为研究混凝土-CA砂浆双材料界面端的应力场奇异性,建立混凝土-CA砂浆双材料复合试件轴拉计算模型,并对界面拉应力分布进行分析。基于Bogy特征方程,提出消除混凝土-CA砂浆复合试件界面端奇异性的方法。研究结果表明:混凝土与CA砂浆界面端附近存在应力奇异现象,该应力奇异现象使得界面端点处的应力明显增加。当结合角组合θ1=θ2≤72°时,混凝土-CA砂浆界面端的应力奇异性消失,此时应力场为一定值。研究成果可为精确的双材料界面黏结强度试验提供理论依据。In order to study the stress singularity at interfacial edges of concrete and CA mortar,a model for calculating the axial tension of concrete-CA mortar bi-material composite specimen was established,and the tension stress distribution along the interface was analyzed.Based on the characteristic equation of Bogy,the method to eliminate the stress singularity at interfacial edges of concrete and CA mortar was presented.The results show that,there is a phenomenon of stress singularity at interfacial edges of concrete and CA mortar.The stress singularity at interfacial edges of concrete and CA mortar disappears when the bond angle satisfiesθ1=θ2≤72°,and the stress field remains constant.The research findings presented could provide a theoretical basis for conducting the accurate tests for bonding strength of bonded dissimilar materials.

关 键 词：板式无砟轨道 双材料界面端 应力奇异性 Bogy特征方程 结合角组合 

分 类 号：U213.211[交通运输工程—道路与铁道工程]