高温后CFRP-MOC-混凝土界面粘结特性研究  

Research on Bonding Characteristics of CFRP-MOC-Concrete Interface after High Temperature

作　　者：赵少伟 吕冉 郭蓉 王佳 ZHAO Shaowei;Lu Ran;GUO Rong;WANG Jia(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin,China,300401)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第4期642-650,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51878238)。

摘　　要：目的研究高温处理后氯氧镁水泥胶(MOC)粘贴CFRP布加固混凝土的粘结性能,为高温环境下CFRP加固混凝土的工程应用提供参考。方法采用单面剪切试验,分析温度作用以及CFRP布宽度对CFRP-MOC-混凝土界面、荷载-滑移、应变分布等粘结性能指标的影响,对高温后CFRP-MOC-混凝土界面的有效粘结长度和极限承载力进行研究。结果随着温度的升高,极限承载力下降,界面整体刚度降低,粘结界面的最大应变不断降低;随着CFRP布宽度的增加,极限承载力增大,界面整体刚度增加,粘结界面的最大应变也增大。结论笔者建立的高温损伤后CFRP-MOC-混凝土有效粘结长度及界面承载力计算模型可信度较高,可以用来预测高温环境下CFRP-MOC-混凝土界面承载力。Magnesium oxychloride cement(MOC)bonding CFRP cloth to reinforce concrete was used to investigate the bonding performance after high temperature treatment.It provides reference for engineering application of CFRP reinforced concrete under high temperature environment.Single shear test was used to analyze the influence of temperature and width of CFRP cloth on bonding performance such as load-slip,strain distribution of CFRP-MOC-concrete interface.Effective bond length and ultimate bearing capacity of CFRP-MOC-concrete interface after high temperature were studied.With the increase of temperature,ultimate bearing capacity will decrease,overall stiffness of interface will decrease,and maximum strain of bonding interface will decrease continuously.With the increase of the width of CFRP cloth,the ultimate bearing capacity and the overall stiffness of the interface increase,as well as maximum strain of bonding interface.The calculation model of effective bond length and interface bearing capacity of CFRP-MOC concrete after high temperature damage is established,which can be used to predict the interface bearing capacity of CFRP-MOC concrete under high temperature environment.

关 键 词：粘结性能 MOC 混凝土 高温处理 有效粘结长度 界面承载力 

分 类 号：TU375[建筑科学—结构工程]