碳纤维布加固钢筋混凝土梁的力学性能试验
2015-10-21陈强刘灵勇周先雁
陈强 刘灵勇 周先雁
摘要:针对损伤严重钢筋混凝土梁进行环氧树脂修复与碳纤维布加固,加固之后进行力学性能试验,试验结果表明,三根损伤严重破坏的钢筋混凝土梁加固修复处理后,梁的荷载挠度曲线及荷载应力曲线呈现线性,极限承载能力提高达50%左右,结构延性略有下降,结构破坏形态类似受弯构件正截面破坏。试验证明,采用的碳纤维布加固和环氧树脂修复已破坏的钢筋混凝土构件的方法是行之有效的,可为实际工程加固设计提供理论和实际参考。
关键词:碳纤维布;钢筋混凝土梁;加固;试验
中图分类号:S 7;TU 375文献标识码:A文章编号:1001-005X(2015)01-0112-06
Mechanical Performance Test of Reinforced Concrete
Beam with Carbon Fiber Cloth
Chen Qiang1,2,Liu Lingyong1,Zhou Xianyan2
(1.College of Civil Engineering,Hunan City University,Yiyang 413000,Hunan Province;2.College of Civil
Engineering and Mechanics,Central South University of Forestry and Technology,Changsha 410004)
Abstract:Mechanical performance test on reinforced concrete beams with carbon fiber cloth and epoxy resin were done in this paper.The test beams had seriously structural damage before reinforcement.The test results showed that after reinforcement the loaddeflection curve and loadstress curve of test beams were basically linear,and the ultimate bearing capacity of the beams increased by almost 50%.The structural ductility declined slightly and the breaking form was similar to the failure in normal cross section.The test results indicated that the method of reinforcing concrete component with carbon fiber cloth and epoxy resin was effective,which can provide references for reinforcing design of a real project.
Keywords: carbon fiber cloth;reinforced concrete beam;reinforcement;test
收稿日期:2014-09-28
基金項目:湖南省科技厅科技计划项目(2012GK3066)
第一作者简介:陈强,博士研究生,副教授。研究方向:桥梁结构理论分析。Email:846039016@qq.com
引文格式:陈强,刘灵勇,周先雁.碳纤维布加固钢筋混凝土梁的力学性能试验[J].森林工程,2015,31(1):112-117.混凝土结构在使用期间会受到不同程度的破坏损伤,对建筑物结构产生安全隐患。因此,对已受损的钢筋混凝土结构进行补强与加固已经成为建筑业的一个新的热点[1-2]。目前,关于建筑结构的加固方法较多,本实验以环氧树脂修复与碳纤维布的加固应用为例。他们是在混凝土表面粘贴碳纤维布,使得混凝土结构和碳纤维布整体受力,提高原来结构的抗弯或抗剪能力。相对其他加固方法,此法能明显提高强度,质量很轻且耐腐蚀,施工操作极为方便且对原来结构影响小,应用前景大[3-6]。……
