PVC-CFRP管钢筋混凝土轴压短柱试验研究  

Experimental study on PVC-CFRP confined reinforced concrete short column under axial compression

作　　者：于峰[1] 牛荻涛[2] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2013年第6期129-136,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51278403;51008001);安徽省自然科学基金(1208085QE88);住房和城乡建设部科学技术项目(K4201222);安徽省住房和城乡建设厅科学技术项目(2011YF-20;2011YF-24)

摘　　要：通过10根PVC-CFRP管钢筋混凝土短柱轴压试验,分析CFRP条带环箍间距和轴向配筋等因素对PVC-CFRP管钢筋混凝土短柱承载力、变形以及破坏形态的影响。试验研究表明:与无筋试件相比,配筋率为1.8%的配筋试件的承载力和轴向极限压应变分别提高约24%和16%;随着CFRP条带环箍间距的增大,配筋试件的承载力和轴向极限压应变逐渐减小;配筋试件破坏时,试件中部多条CFRP条带拉断并伴随纵向钢筋压屈。PVC-CFRP管钢筋混凝土的应力-应变关系曲线可以分为三段:第一段的应力-应变关系曲线为抛物线;第二段为曲线过渡段;第三段为强化段,配筋试件的应力和应变一直处于递增状态,与无筋试件相比,配筋试件强化段斜率较大。根据静力平衡条件和极限平衡条件,推导出PVC-FRP管混凝土柱承载力的计算式,计算结果与试验值吻合较好。This paper presents the results of experimental investigations on 10 PVC-CFRP confined reinforced concrete columns.The influences of the hoop spacing of CFRP strips and the axial reinforcement on the load-carrying capacity,deformation and failure mode of PVC-CFRP confined reinforced concrete columns were studied.Test results show that the load-carrying capacity and ultimate compressive strain of axially reinforced members with reinforced ratio 1.8% respectively increase about 24% and 16% compared with those of members without axial reinforcement;the load-carrying capacity and ultimate compressive strain decrease with the increase of the hoop spacing of CFRP strips;when the axially reinforced members fail,multiple CFRP strips fracture and longitudinal reinforcement buckle at the middle height of the specimens.The stress-strain relationship curves of PVC-CFRP confined reinforced concrete column may be divided into three stages： at the first segment,the stress-strain relationship curves is parabola;at the second segment,the stress-strain relationship exhibits an obvious transition segment;at the third segment,before the failure of the axially reinforced members,the axial stress and strain is in the increasing state.The slope tangent of the hardening segment of axially reinforced members is larger than that of members without axial reinforcement.Based on the static equilibrium and limit equilibrium,a calculating formula of the bearing capacity of PVC-FRP confined concrete column was derived.The calculated values of the proposed formula agree well with the experimental results.

关 键 词：混凝土短柱 PVC-CFRP管 轴压试验 承载力 极限压应变 应力-应变关系 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1