Study on mechanical behavior of square hollow concrete-encased CFST columns with inner steel plate under axial compression

被引：0
|
作者：
Zhao H. [1 ]
Zhang Y. [1 ]
Wang R. [1 ]
机构：
[1] College of Civil Engineering, Taiyuan University of Technology, Taiyuan
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2022年 / 43卷 / 06期
关键词：
Axial compression performance; Bearing capacity; Concrete-encased CFST column; Design formula; Finite element analysis; Inner steel plate; Static test;
D O I：
10.14006/j.jzjgxb.2020.0531
中图分类号：
学科分类号：
摘要：
To clarify the square hollow concrete-encased concrete filled steel tubular (CFST) columns with inner steel plate, a total of 8 square hollow concrete-encased CFST columns with inner steel plates were tested, considering various strengths and thicknesses of steel tubes and inner steel plates. The finite element analysis of 81 composite short columns was carried out, with consideration of various section sizes, concrete strength inside and outside steel tube, steel strength, as well as the amount of longitudinal reinforcement and steel tube. The whole process behavior of the typical specimen, the contact stress between each component, and influence parameters of ultimate capacity under compression were emphatically analyzed. Finally, the load-carrying capacities were obtained through adding the load-bearing capacity of inner steel plate, based on using the modified load-carrying capacities formulas of ANSI/AISC 360-16, BS EN1994-1-1, GB 50936-2014, and T/CECS 663-2020. Results showed that the outer concrete, inner steel plate, steel tube, longitudinal reinforcement, and core concrete of the member can work together under axial compression. The inner steel plate has a marginal influence on the bearing capacity, ductility, and stiffness of the members. The section dimension and concrete strength contribute the most portion of the loading capacity. However, the ductility of the member decreases with the increasing concrete strength. By adding the contribution of the steel plate to the formulas in T/CECS 663-2020 and ANSI/AISC 360-16, the calculated load-bearing capacities are closest to the results obtained from test and FE model. © 2022, Editorial Office of Journal of Building Structures. All right reserved.
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页码：53 / 62and141
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