低周反复荷载作用下PVC-CFRP管钢筋混凝土柱受剪承载力分析  

Analysis on shear bearing capacity of PVC-CFRP confined reinforced concrete column under cyclic reversed loading

作　　者：于峰[1] 徐国士[1] 程安春[1] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002

出　　处：《建筑结构学报》2016年第11期106-112,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51008001;51578001);安徽省教育厅自然科学研究重大项目(KJ2015ZD10)

摘　　要：为研究PVC-CFRP管钢筋混凝土柱的受剪性能,在已完成的8根PVC-CFRP管钢筋混凝土柱和2根PVC管钢筋混凝土柱的低周反复荷载试验基础上,考虑轴压比、剪跨比、CFRP条带环箍间距对PVC-CFRP管钢筋混凝土柱受剪承载力的影响,选择CFRP布、PVC管、核心混凝土和钢筋的应力-应变关系模型,将圆形截面等效为矩形截面。利用桁架-拱模型对PVC-CFRP管钢筋混凝土柱的受剪机理进行分析,提出PVC-CFRP管钢筋混凝土柱受剪承载力计算公式。考虑低周反复荷载作用对构件受剪承载力的影响,引入位移延性系数,给出了低周反复荷载作用下PVC-CFRP管钢筋混凝土柱受剪承载力的设计公式,计算结果与试验结果吻合较好。In order to study the shear capacity of PVC-CFRP confined reinforced concrete column, based on the existing experiments of eight PVC-CFRP confined reinforced concrete columns and two PVC tube confined reinforced concrete columns under cyclic reversed loading, the effect of shear bearing capacity of PVC-CFRP confined reinforced concrete column, such as axial compression ratio, shear-span ratio and hoop spacing of CFRP strips are considered. Meanwhile, the suitable stress-strain relationship models of CFRP strips, PVC tube, core concrete and reinforcement are selected. The circular section is equivalent to the rectangular section. The shear mechanism of PVC-CFRP confined reinforced concrete column is analyzed based on truss-arch model, and then the calculating method of shear bearing capacity of PVC-CFRP confined reinforced concrete column is proposed. Considering the effect of cyclic reversed loading on shear bearing capacity of members, the displacement ductility coefficient is introduced, and then the design formula of shear bearing capacity of PVC-CFRP confined reinforced concrete column under cyclic reversed loading is put forward. The calculated values of the proposed formula agree well with the experimental results.

关 键 词：PVC—CFRP管钢筋混凝土柱 低周反复荷载 桁架-拱模型 受剪承载力 

分 类 号：TU398.902[建筑科学—结构工程]