RESEARCH ARTICLE


Flexural Behavior of Casing Joint of Square Steel Tube



Jinsan Ju1, Zhenhua Hou1, Xiugen Jiang1, Yuzhi He1, Guangkui Zhang1, Zichen Lin2, Min Ding1, *
1 Department of Civil Engineering, China Agricultural University, Beijing 100083, China
2 School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China


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© Ju et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Civil Engineering, China Agricultural University, Beijing 100083, China; Tel: +86-010-62737130 (Office), +86-15901504286 (Mobile);Fax: +86-010-62736526;


Abstract

The tests on thirteen specimens of casing joints of square steel tube were conducted to investigate the flexural behavior of the joints. At the same time, the numerical simulation studies on that of the joints were carried out by using finite element analysis software ANSYS/LS-DYNA with consideration of geometric nonlinearity, material nonlinearity and contact nonlinearity. On this basis, the effects of tube wall thickness, tube edge length, and inserting depth on failure mode, ultimate flexural capacity and deformation of casing joint of square steel tube was discussed. The results show that there are two types of failure modes, i.e., inside tube yield failure and outside tube shear failure, when the joints are subjected to lateral load. Ultimate flexural capacity and rigidity of casing joint of square steel tube increased with the inserting depth increasing. The ultimate flexural capacity of the joint is proportional to tube shear strength, tube wall thickness, inserting depth, and tube edge length. The fruits are useful to the design and application of casing joints of square steel tube.

Keywords: Casing joint, flexural behavior, experiment.