摘要
轨道板与CA砂浆层间离缝是CRTSⅡ型板式无砟轨道结构的主要病害之一。为描述轨道板-CA砂浆层间界面本构行为、揭示层间离缝机理,该文提出了一种改进指数型界面内聚力模型,并基于理论分析和试验数据确定了改进模型的参数取值。该模型为含有指数系数的分段函数,可以表征层间界面拉力-位移关系的非线性特征。研究结果表明:改进指数型内聚力模型可以高效计算轨道板-CA砂浆界面内聚强度、损伤萌生时界面相对位移和界面临界断裂能,结果与试验值基本一致;改进指数型模型可以较为准确地模拟轨道板-CA砂浆界面的法向和切向开裂行为。
Debonding between track slab and CA mortar layer is one of the main defects of CRTS Ⅱ slab-type ballastless track system.In order to describe the constitutive behavior of the interface and reveal the mechanism of debonding,an improved exponential cohesive zone model was proposed with parameters determined based on theoretical analysis and experimental data.The proposed model is a segmentation function and adopts exponential coefficients to reflect the nonlinearity of the tension-displacement relationship of the interlayer interface.It is found that:The proposed model can efficiently calculate the interface cohesive strength,the interface relative displacement at damage initiation,and the interface critical fracture energy between track slab and CA mortar,and the results are basically consistent with the experimental results.The proposed model can simulate the normal and tangential cracking behavior of the interface between track slab and CA mortar layer with relatively high accuracy.
作者
王军
卢朝辉
张玄一
赵衍刚
WANG Jun;LU Zhao-hui;ZHANG Xuan-yi;ZHAO Yan-gang(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Department of Architecture,Kanagawa University,Yokohama 221-8686,Japan)
出处
《工程力学》
EI
CSCD
北大核心
2022年第9期72-80,109,共10页
Engineering Mechanics
基金
国家自然科学基金项目(51820105014,52108104)。
