CFRP-圆钢管混凝土加固RC方形短柱的承载力  

Load-bearing capacity of RC square short column strengthened with CFRP and circular CFST

作　　者：赵均海[1] 陈彦雄 张焕青 ZHAO Jun-hai;CHEN Yan-xiong;ZHANG Huan-qing(School of Civil Engineering, Chang'an University, Xi'an 710061, China;China Northwest Architecture Design and Research Institute Co. , Ltd. , Xi'an 710018, China)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]中国建筑西北设计研究院有限公司,西安710018

出　　处：《广西大学学报（自然科学版）》2021年第5期1130-1138,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51878056);陕西省科技计划—社会发展领域项目(2019SF-256)。

摘　　要：为了研究CFRP-圆钢管混凝土复合加固RC短柱的极限承载力,将该柱划分为CFRP管、钢管、后浇混凝土、RC柱四个部分,采用统一强度理论,考虑CFRP和钢管的受力特点及其对混凝土和RC柱的约束作用,对该柱的轴心受压机理进行理论分析,提出了该柱的轴心受压承载力计算式,并基于此考虑长细比和偏心率的影响,得到偏心受压承载力计算式。将理论计算结果与文献试验数据进行对比,证明该计算式的正确性。对参数进行分析,结果表明:承载力随中间主应力系数和侧压力系数增大而增大;承载力随钢管的径厚比、钢筋混凝土柱与钢管边径比的增大而明显减小;径厚比越大,CFRP厚度对承载力的影响越明显;偏压承载力随偏心率的增大而明显降低。In order to study the ultimate bearing capacity of the RC short column reinforced by CFRP and circular steel tube concrete,the column was divided into four parts:CFRP tube,steel tube,post-cast concrete and RC column.Using the unified strength theory,considering the stress characteristics of CFRP and steel tube and their restraining effects on concrete and RC column,the axial compression mechanism of the RC short was analyzed theoretically.Finally,the calculation formula of bearing capacity for the column under axial compression was proposed.On this basis,considering the effects of slenderness ratio and eccentricity ratio,the calculation formula of bearing capacity under eccentric compression was obtained,too.The theoretical calculation results were compared with the experimental data in literature,and the calculation formula was proved to be correct.In addition,the parameter analysis was carried out.The results show that:the bearing capacity increases with the increase of intermediate principal stress coefficient or lateral pressure coefficient;the bearing capacity decreases obviously with the increase of diameter to thickness ratio of steel tube or side length to diameter ratio of RC column to steel tube;the greater the ratio of diameter to thickness,the more obvious the influence of CFRP thickness on the bearing capacity;the bearing capacity under eccentric compression decreases obviously with the increase of eccentricity ratio.

关 键 词：CFRP-圆钢管 复合加固 RC短柱 极限承载力 统一强度理论 

分 类 号：TU398.9[建筑科学—结构工程]