摘要
为探究层间黏结参数对轨道板与自密实混凝土界面连接性能的影响,建立含内聚力模型的CRTSⅢ型板式无砟轨道有限元仿真模型,分析了温度梯度作用下不同法向和切向黏结参数对层间损伤发展规律的影响.研究结果表明:降低界面刚度和增大断裂能分别对延缓界面损伤萌生和层间脱黏具有一定的效果,但不显著;增大内聚强度可有效控制界面损伤的发展,提高损伤萌生和层间脱黏的起始温度梯度的最大幅度分别为125%和54%;正温度梯度90℃/m作用下,改变法向黏结参数对层间脱黏率影响较小,但增大切向内聚强度和断裂能均可有效减小界面损伤区域,层间脱黏率降低值大于15%.
In order to investigate the influence of interlayer adhesion parameters on the interface connection between track slab and self-compacting concrete,a finite element simulation model of CRTS(China railway track system)Ⅲ prefabricated slab track with cohesion model was established and the influence of different normal and tangential adhesion parameters on the interlayer damage development under the temperature gradient load was analyzed.The results show that reducing the interfacial stiffness and increasing the fracture energy have some effects on delaying the initiation of interfacial damage and interlayer debonding,but the effect is not significant.Increasing the cohesive strength can effectively control the development of interfacial damage and increase the magnitude of the starting temperature gradient for damage occurrence and interlayer debonding by a maximum of 125%and 54%,respectively.Under the effect of positive temperature gradient loading of 90℃/m,changing the normal adhesion parameter has less effect on the interlayer debonding rate,but increasing the tangential adhesion strength and fracture energy can effectively reduce the interfacial damage area,and the reduction value of interlayer debonding rate is greater than 15%.
作者
杜威
任娟娟
杜俊宏
屈昌衡
DU Wei;REN Juanjuan;DU Junhong;QU Changheng(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《华中科技大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2024年第2期120-126,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家重点研发计划资助项目(2021YFB2600900,2021YFF0502100)
国家自然科学基金资助项目(52022085,52278461)
高速铁路无砟轨道设计与维护四川省青年科技创新研究团队项目(2022JDTD0015).
关键词
板式无砟轨道
界面损伤
黏结参数
温度梯度荷载
脱黏率
prefabricated slab track
interface damage
adhesion parameters
temperature gradient load
debonding rate