(西南科技大学土木工程与建筑学院，绵阳621010)

［摘要］对在汶川地震中震损建筑物中拆下的强度等级约为C13的RC梁加固后进行抗弯承载力试验研究，根据7组21个试件的三分点加载试验，对梁的承载力、刚度和延性等进行综合评估。结果表明：与直接粘贴CFRP布相比，采用剔槽植入钢筋置换混凝土灌胶再粘贴CFRP布复合加固方案加固的梁极限承载力有显著提高，开裂荷载及延性有较大提高；试验中复合加固方案的CFRP布上的最大应力值比直接粘贴CFRP布的大2~4倍，很好地发挥了CFRP布的高强作用；加载中复合加固方案的CFRP布被拉断，经计算并结合试验结果，加固设计中梁的抗弯承载力提高数值满足相关规范要求，可避免CFRP布的拉断。

［关键词］损伤RC梁；CFRP布加固；抗弯承载力；延性；破坏模式

中图分类号：TU375.1文献标识码：A文章编号：1002-848X(2011)02-0120-04

Experiment on flexural capacity of damaged RC beams strengthened by composite CFRP sheets

Chu Yunpeng, Jia Bin, Yao Yong, Wang Ruheng

(College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China)

Abstract:The experimental study on flexural capacity of RC beams about C13, which were detached from the damaged building of Wenchuan earthquake and were strengthened, was carried out. Based on the results of three points of division loading test on 21 models which were divided into 7 groups, the bearing capacity, stiffness and ductility were comprehensively evaluated. Results show that ultimate bearing capacity of RC beam strengthened by composite CFRP sheets is much higher than that of direct pasting CFRP. Cracking load and ductility are improved higher too. The maximum stress of CFRP on which reinforcement compound solutions is 2-4 times bigger than that of direct pasting and the high-strength effect of CFRP is used very well. The CFRP of reinforcement compound solutions were ruptured under given ultimate loads, and it would be avoided if the increased value meet interrelated laws by compositing calculation and test results.

Keywords:damaged RC beam; CFRP sheets strengthening; flexural capacity; ductility; failure mode

国家“863”高新技术研究与发展计划项目(2009AA032304)。

作者简介：褚云朋，硕士，讲师，Email:chuyunpeng@swust.edu.cn。

参考文献

［1］YEONG-SOO SHIN，CHADON LEE. Flexural behavior of reinforced concrete beams strengthened with carbon fiber-reinforced polymer laminates at different levels of sustaining load ［J］. ACI Structural Journal，1999，96(3)：212-220.

［2］CAMPIONE G, MIRAGLIA N.Strength and strain capacities of concrete compression members reinforced with FRP［J］. Cement and Concrete Composites,2003,25(1):31-41.

［3］KHALIFA A,NANNI A. Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites［J］. Construction and Building Materials,2002，16(3)：135-146.

［4］王震宇，李洪鹏. 重复荷载作用下碳纤维约束混凝土加卸载准则［J］. 建筑结构，2009，39(7)：100-103.

［5］刘进军，王天稳. 碳纤维布加固框架节点低周反复荷载试验研究［J］. 建筑结构，2010，40(2)：70-73.

［6］王苏岩，刘贵，周英武. GFRP-高强混凝土界面黏结-滑移关系研究［J］. 土木工程学报，2009，42(6)：8-13.

［7］叶列平，方团卿，岳清瑞. 碳纤维布在混凝土梁受弯加固中抗剥离性能的试验研究［J］. 建筑结构，2003，33(2)：7-12.

［8］王晓刚，顾祥林，张伟平. 碳纤维布加固锈蚀钢筋混凝土的抗弯刚度［J］.建筑结构学报，2009，30(5)：169-176.

［9］李世宏. 碳纤维布应力松弛试验研究［J］.建筑结构，2009，39(4)：72-75.

［10］甘贤军. CFRP加固钢筋混凝土梁(受弯构件)试验研究［D］. 重庆：重庆大学，2004.

［11］刘其卓. 碳纤维布加固不同损伤混凝土梁抗震性能的试验研究［D］. 武汉：武汉理工大学，2004.

［12］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，2007.

［13］JGJ116—2009 建筑抗震加固技术规程［S］. 北京：中国建筑工业出版社，2009.

［14］赵新，源维刚. 旧房钢筋混凝土梁的加固［J］. 建筑施工，1997，19(6)：39-40.

［15］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.