Local buckling behaviour of the steel tube in elliptical CFST columns

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-03-19 DOI:10.1016/j.istruc.2025.108648

Bo-Song Li, Yue-Ling Long, Xiang-Hua Yue

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引用次数: 0

Abstract

Local buckling behaviour of the steel tube in elliptical concrete-filled steel tube (CFST) columns is investigated. A new model for local buckling of the steel tube in elliptical CFST columns under axial compression is proposed, assuming that the column ends are fixed and the concrete infilled is rigid. This proposed model involves the characteristics of elliptical section and account is taken of the influence of concrete infilled.The corresponding formula for elastic critical local buckling stress of the steel tube in elliptical CFST columns is derived. Subsequently, the calculated results by the proposed model are respectively compared with the results of tests and the previous theoretical model, which exhibits good agreement. Then the proposed formula is applied to investigate the local buckling behaviour of the steel tube in elliptical CFST columns. It is found that the local buckling behaviour of elliptical CFST columns is intermediate between that of circular CFST columns and that of rectangular CFST columns, and it is significantly influenced by both the relative thickness and aspect ratios (2a/2b), in which greater influence is found due to the relative thickness (2b/t_s). The critical local buckling stress of elliptical CFST columns decreases with aspect ratios (2a/2b) increasing. The critical local buckling stress of the steel tube in elliptical CFST columns significantly decreases with the relative thickness increasing. Besides, the concrete infilled can significantly increase the local buckling behaviour of elliptical hollow columns. Furthermore, the influence of the concrete infilled on the local buckling behaviour decreases with the relative thickness increasing while it increases with the aspect ratios increasing. Finally, reasonable ranges of the relative thickness are suggested for design of elliptical CFST columns.

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.