（1 浙江大学城市学院，杭州 310015； 2 华汇工程设计集团有限公司，绍兴 312000； 3 浙江大学，杭州 310027）
［摘要］针对加固时已卸载的混凝土受弯构件开展碳纤维布(CFS)加固性能研究。共进行了17根混凝土梁的试验，包括2根对比梁和15根CFS抗弯加固梁。研究了开裂程度、CFS加固层数对加固构件的破坏形态、承载力等力学性能的影响。总结了CFS加固开裂混凝土受弯构件时曾加荷载的上限范围，给出了CFS加固合理用量的建议。
［关键词］CFS；卸载；加固；混凝土受弯构件；抗剪性能；试验
Study on flexural behavior of pre-cracked RC beams strengthened with externally bonded CFS
Liao Juan1, Jin Jian2, Xu Xing3（1 Zhejiang University City College, Hangzhou 310015, China; 2 Engineering Design Group of Huahui Co., Ltd., Shaoxing 312000, China; 3 Zhejiang University, Hangzhou 310027, China）
Abstract:The flexural behavior of pre-cracked RC beams strengthened with externally bonded CFS, which loads have been removed before strengthening, is studied. The effect of the loads which have been removed and plies of CFS are investigated. A series of 17 RC beams(including 2 contrast beams and 15 retrofitted with CFS) were tested to investigate the effect of preload and number of plies of CFS. The study indicated that the ultimate capacity and the stiffness of strengthened beams are increased compared with contrast beam except that the value of preload is under a certain degree. The upper limit of preload was found out and the number of CFS plies was also suggested.
Keywords:CFS; removed load; strengthening; pre-cracked RC beam; flexural behavior; test of structural member
作者简介：廖娟，博士，讲师，Email:liaoj@zucc.edu.cn。
参考文献
［1］GB50367—2006混凝土结构加固设计规范［S］.北京：中国建筑工业出版社，2006.
［2］CECS146：2003碳纤维片材加固修复混凝土结构技术规程［S］.北京：中国计划出版社，2003.
［3］Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures［S］.ACI Committee 440，2002.
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