Axial compression capacity of square steel-concrete-FRP-concrete composite columns 内置约束芯柱的方钢管混凝土组合柱轴压承载力分析

Tao，Yi1,2; Ye，Sijun1; Chen，Jianfei3

2022-03-05

10.14006/j.jzjgxb.2020.0082

建筑结构学报   影响因子和分区

1000-6869

Steel-concrete-FRP-concrete (SCFC) composite column can improve the nonuniform confinement from the square steel tube because of the appearance of the FRP-confined concrete core. The confinement demands of the concrete core can be satisfied from the confinement provided from inner FRP, sandwich concrete and outer steel tubes. In order to establish the axial bearing capacity model of the composite column and analyze the influence of the main parameters, an axial compression test on four SCFC composite columns was carried out with varying diameters of the FRP confined concrete core and FRP thickness. The failure process of the columns was analyzed in order to study the axial compression performance of composite column. An effective confinement model was proposed for square steel tube to consider the improvements on the nonuniform confinement of the square steel tube due to the application of FRP-confined concrete core. The bearing capacity of each component of SCFC column was calculated using the twin shear unified strength theory (model 1). In addition, the von Mises yield criterion was also adopted to calculate the bearing capacity of steel tube for comparison (model 2). The axial bearing capacity model for SCFC column was eventually proposed by superimposing the bearing capacity of each component. It is found that the predictions from the twin shear unified strength theory is more accurate than those from the von Mises yield theory model. It is also found that the influence of lateral pressure coefficient of concrete core on bearing capacity is more significant than that of sandwich concrete. It means that the axial bearing capacity of SCFC column is dominated by the concrete core and its confinements. The value of lateral pressure coefficients for model 2 is finally recommended to be 1.5. It is concluded that increasing FRP thickness is efficient to promote the bearing capacity of SCFC column.

Axial compression bearing capacity Axial compression test Effective confinement coefficient SCFC composite column Twin shear unified strength theory Von Mises yield criterion

EI

中文

其他

20215211400976

Bearing capacity ; Columns (structural) ; Compression testing ; Concrete testing ; Concretes ; Tubes (components) ; Tubular steel structures

Structural Members and Shapes:408.2 ; Concrete:412 ; Steel:545.3 ; Pipe, Piping and Pipelines:619.1

2-s2.0-85111765682

Scopus

1.School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China
2.State Key Laboratory of Green Building in Western China,XAUAT,Xi'an,710055,China
3.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Tao，Yi,Ye，Sijun,Chen，Jianfei. Axial compression capacity of square steel-concrete-FRP-concrete composite columns 内置约束芯柱的方钢管混凝土组合柱轴压承载力分析[J]. 建筑结构学报,2022,43(3):148-158.

Tao，Yi,Ye，Sijun,&Chen，Jianfei.(2022).Axial compression capacity of square steel-concrete-FRP-concrete composite columns 内置约束芯柱的方钢管混凝土组合柱轴压承载力分析.建筑结构学报,43(3),148-158.

Tao，Yi,et al."Axial compression capacity of square steel-concrete-FRP-concrete composite columns 内置约束芯柱的方钢管混凝土组合柱轴压承载力分析".建筑结构学报 43.3(2022):148-158.