硫酸盐干湿循环作用下CFRP-黏土砖界面黏结性能试验研究  

Drying and watering cycle of sulfate’s influence on the adhesion of the interface of the bricks of burnt clay

作　　者：靳文强[1,2] 聂丹 王琦 张家玮[1,2] 赵建昌[1,2] 郭乐乐 JIN Wenqiang;NIE Dan;WANG Qi;ZHANG Jiawei;ZHAO Jianchang;GUO Lele(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road&Bridge Disaster Prevention and Control Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [3]中国铁路设计集团有限公司,天津300308

出　　处：《铁道科学与工程学报》2021年第5期1248-1255,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51368035);兰州市科技计划资助项目(2018-1-18);兰州市人才创新创业资助项目(2018-RC-57)。

摘　　要：通过单面剪切试验装置对硫酸盐干湿循环作用后的CFRP-黏土砖试件进行加载,研究硫酸盐干湿循环作用下CFRP-黏土砖界面黏结性能退化规律。研究结果表明:界面破坏形态随硫酸盐干湿循环由剪切破坏转变为黏结破坏,界面有效黏结长度和承载力随硫酸盐干湿循环时间在初期均有所增长,后期均呈下降的趋势。通过引入硫酸盐干湿循环影响系数,提出了硫酸盐干湿循环作用下CFRP-黏土砖界面黏结强度模型。通过与试验值对比,本文建议的模型可以准确预测硫酸盐干湿循环作用下界面黏结强度的退化规律。Through a simple shear test device,the loading experiment was carried out to the CFRP-brick pieces after the effect of sulfate drying and wetting cycles was considered.The degradation law of CFRP-brick interfacial bond performance was studied with the drying and wetting cycle times.The experiment results are as follows.The interface destruction patterns change from shear destruction to bonding destruction with the dry and wet cycle of sulfates.The interfacial bond strength,the interfacial fracture energy and the effective bond length increase at the initial stage,and at the later stage,it has a trend of decrease.By introducing the influence coefficient of sulfate drying and wetting cycles,the bond strength model of CFRP-brick interface under sulfate drying and wetting cycles was established.By comparing the experimental values,the law of degradation of interfacial bond strength under the function of the sulfate drying and wetting cycles could be accurately predicted by the model which is proposed in this paper.

关 键 词：硫酸盐干湿循环 CFRP-黏土砖 有效黏结长度 黏结强度 

分 类 号：TU362[建筑科学—结构工程]