Seismic behavior of circular CFST columns with stiffeners

被引：0

作者：

Dong H. ^{[1
]}

Qin J. ^{[1
]}

Cao W. ^{[1
]}

Zhao L. ^{[1
]}

Yin F. ^{[1
]}

机构：

[1] Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷

关键词：

Circular CFST column; Circumferential stiffener; Finite element model; Low cyclic loading test; Seismic behavior; Vertical stiffener;

D O I：

10.14006/j.jzjgxb.2021.S2.0033

中图分类号：

学科分类号：

摘要：

In order to investigate the influence of stiffeners on the seismic performance of circular concrete-filled steel tube (CFST) columns, low-cycle reversed loading tests of five circular CFST columns with stiffeners were conducted. The main parameters covered the shear span to depth ratio and the arrangement of stiffeners. The shear span to depth ratios were 3.0 and 2.2, and the cross-sections were set as steel tube, steel tube with welded circumferential stiffeners, and steel tube with both welded circumferential and vertical stiffeners. The failure characteristics, hysteresis behavior, bearing capacity, ductility, stiffness degradation, and energy dissipation capacity of each specimen were analyzed. The test results show that the addition of the circumferential stiffeners can improve the flexural bearing capacity and ductility of the specimen, and the circumferential stiffeners have a significant effect on enhancing the local stability of the steel tubes and limitting the buckling. Setting both the circumferential and vertical stiffeners can further improve the flexural bearing capacity and ductility. By reducing the shear span to depth ratio, the initial stiffness can be significantly improved, but the stiffness degradation rate is faster, and the cumulative damage effect is more significant. The calculated values under the combined effect of compression, bending, and shearing based on the formula of the CFST column bearing capacity according to DBJ/T 13-51-2010 are lower than the test results, showing the code formula is safer. A nonlinear finite element (FE) model was carried out using ABAQUS, and the comparison shows that the FE analysis results are in good agreement with the test results. Based on this FE model, the parametric analysis was conducted. The effect of vertical ribs on the bearing capacity of circular CFST column is higher than that of the circular ribs. Increasing the thickness of steel tube and improving yield strength of steel tube can improve the bearing capacity and ductility. Increasing the compression strength of concrete can not significantly improve the bearing capacity, and the ductility becomes worse. © 2021, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：278 / 287

页数：9

共 20 条

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