cfrp-应用基础与工程科学学报.doc

碳纤维布加固对腐蚀钢筋与混凝土粘结性能的影响 邓宗才，万操，李建辉 （北京工业大学 城市与工程防灾减灾省部共建教育部重点实验室 北京100124Polymer）加固对腐蚀钢筋与混凝土粘结性能的影响是确定FRP加固效果的重要问题之一。本文采用外加电流加速腐蚀法对96个预埋钢筋的试件进行腐蚀，腐蚀完成后横向包裹2层单向碳纤维布；通过拉拔试验研究了碳纤维布加固对腐蚀钢筋与混凝土粘结性能的影响规律，探讨了拉拔破坏机理；试验考虑了钢筋种类、保护层厚度、腐蚀率及碳纤维布约束等影响因素。研究strengthened with carbon fiber sheets DENG Zongcai, WAN Cao, LI Jianhui （The Key Laboratory of Urban Security and Disaster Engineering， Ministry of Education， Beijing University of Technology， Beijing 100， Chinabehavior between corroded reinforcement and concrete wrapped with FRP is a chief problem to confirm the effect of FRP confinement. 96 test specimens with embedded reinforcing bars were strengthened by two layer of transverse CFRP after accelerated corrosion. The pullout tests on the test specimens were conducted to study the effect of confining CFRP on the bond behavior between corroded reinforcing bars and concrete, considering the contribution of different elements including reinforcing bar types, cover depths, corrosion rates, and CFRP confinements. The failure mechanisms were studied. The test results show that CFRP confinements can make the failure mode of deformed reinforcing bar specimens change from concrete splitting to bar pull-out. The main influencing factors of the ultimate bond strength are reinforcing bar types and cover depths, and the ultimate bond strength of deformed reinforcing bar specimens is one time larger than that of plain reinforcing bar specimens. When the corrosion rate is less than 5%, the CFRP confinement has less contribution on increasing the ultimate bond strength, but it is effective on slowing down the bond stress’s descending speed and maintaining the bond strength. When the corrosion rate is higher than 5%, the ultimate bond strength of corroded specimens drops gradually along with the rise of corrosion rate. Keywords: bond behavior; corrosion; CFRP; concrete; strengthening 收稿日期：20-10-28 基金项目：国家自然科学基金项目（），北京项目（） 作者简介：邓宗才（1961-），男（汉），陕西扶风人，教授、博士生导师氯离子诱发钢筋是混凝土结构传统加固方法存在钢筋、钢板易施工复杂劳动强度