CFRP约束损伤钢筋混凝土的轴压性能  

Axial Compression Behavior of CFRP-confined Damaged Reinforced Concrete

作　　者：劳晓杰[1,2] 韩小雷[1,3] 季静[1,3] 姜正荣[1,3] 陈彬彬[1] LAO Xiaojie;HAN Xiaolei;JI Jing;JIANG Zhengrong;CHEN Binbin(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China;Architectural Design and Research Institute,South China University of Technology,Guangzhou 510640,Guangdong,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学建筑设计研究院,广东广州510640 [3]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2019年第7期1-9,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51378221);亚热带建筑科学国家重点实验室自主研究项目(2018ZC05)~~

摘　　要：设计了29个不同配箍率、CFRP层数及预损伤水准的钢筋混凝土(RC)方柱试件进行轴压试验;通过对试验数据的回归分析,提出了CFRP约束损伤钢筋混凝土的受压本构模型.结果表明:外包CFRP能有效地恢复甚至提高损伤钢筋混凝土的轴压强度及延性,其加固效果随CFRP用量的增加及预损伤水准的降低更为显著;损伤钢筋混凝土的弹性模量则随着损伤水准的增大而减少;反复荷载作用下C,FRP约束损伤钢筋混凝土的应力-应变曲线的包络线与单调荷载作用下的应力-应变曲线基本重合;文中提出的模型预测与试验数据高度吻合.A total of 29 square reinforced concrete(RC) columns with different amounts of internal steel reinforcement and of externally wrapped CFRP as well as pre-damage levels,were designed and tested under axial compression.On the basis of regression analysis of the test results,a stress-strain model for CFRP-confined damaged reinforced concrete under axial compression was proposed.The test results show that CFRP wrapping is effective in restoring or even enhancing the compressive strength and the strain capacity of damaged reinforced concrete.Both the compressive strength and the ultimate strain of CFRP-confined damaged reinforced concrete increase with the increase of the quantities of CFRP and the decrease of pre-damage levels,while the initial elastic modulus decreases with the increase of pre-damage levels.Under cyclic loading,the envelope curve of cyclic stress-strain response of CFRP-confined damaged reinforced concrete under axial compression coincides with the monotonic counterpart.The prediction provided by the proposed model agrees well with the test results.

关 键 词：CFRP 钢筋混凝土 轴压性能 加固修复 应力-应变模型 

分 类 号：TU375[建筑科学—结构工程]