RESEARCH ARTICLE


Restoring Force Model of Concrete-Filled Square Steel Tubular Columns with Binding Bars



Su Linwang1, 2, Yingtao Wang1, *, Jian Cai1, 3, Yueling Long4
1 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
2 CCCC Fourth Harbor Engineering Institute Co., Ltd. Guangzhou 510230 China
3 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510641, China
4 School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China


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Creative Commons License
© Linwang et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China. Tel: +86-020-87114801; Fax: +86-020-87114801 E-mail: scutwyt@163.com


Abstract

This paper presents a trilinear restoring force model based on the test results of two square concrete-filled steel tubular (CFT) stub columns without binding bars and eight square CFT stub columns with binding bars subjected to constant axial load and cyclic lateral load. The effects of binding bars and axial load level on the specimens are considered to determine the feature points of the skeleton curves. Calculation formulas for the characteristic parameters of the model, including the yield load, the peak load and the ultimate load, are given by analyzing the influence of the confinement factor of steel tube, the confinement coefficient of binding bars and the axial load level. Additionally, the hysteretic rule under cyclic lateral load is confirmed. The predicted hysteretic cures and skeleton curves based on the proposed model are in good agreement with the experimental results.

Keywords: Binding bars, hysteretic rule, restoring force model, skeleton curve, square CFT columns.