摘要
超高性能混凝土（UHPC）修复层与既有混凝土界面的黏结性能是影响修复加固效果的关键。为研究预制UHPC修复层与既有混凝土界面黏结短期性能,通过直剪试验和斜剪试验,分析了界面黏结材料、界面剪力键、混凝土强度、剪切角等对界面黏结强度及黏结滑移的影响;提出了预制UHPC修复层与既有混凝土界面的黏结滑移模型,并给出了黏结刚度建议值。结果表明：结构胶黏结试件的黏结强度较灌浆料黏结试件的强度高,在界面处设置剪力键可提高界面黏结强度;通过斜剪试验获得的界面黏结强度及黏结刚度均得到大幅提高。
The interfacial bond behavior between the precast ultra-high performance concrete （UHPC） layer and existing concrete is critical for rehabilitation. This paper presents an experimental study on the short-term bond behavior of such interfaces using direct shear tests and oblique shear tests. The effects of the interfacial bonding material, the shear key, the strength of concrete and the shear angle on the bond strength and bond-slip properties were examined. A bond-slip model for the interface between the precast UHPC layer and existing concrete was proposed, and the interfacial bond stiffness values for different parameters were suggested. The following conclusions can be drawn ： the bond strength of specimens bonded by a structural adhesive is higher than that of specimens bonded by a grouting material, the bond strength can be improved by shear keys; the bond strength and bond stiffness are greatly increased from the oblique shear tests.
作者
吴香国
张孝臣
WU Xiangguo1,2 , ZHANG Xiaochen1,2(1. Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; 2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of China Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第10期156-163,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51008088,51678196)
中央高校基本科研业务费专项(HIT.NSRIF.2013112)
黑龙江省自然科学基金项目(E2015014)
关键词
超高性能混凝土
既有混凝土
剪切试验
界面黏结性能
滑移
ultra-high performance concrete
existing concrete
shear experiment
interfacial bond behavior
slip
