Experimental study on multi-cellular L-shaped CFST slender columns under biaxial eccentric compression. (November 2022)

• Record Type: Journal Article
• Authors: Zhang, Lei; Zhang, Yu-Jia; Tong, Jing-Zhong; Tong, Gen-Shu; Fu, Bo; Xu, Yi-Min
• Is Part Of: Structures. Volume 45(2022)
• Page Start: 2210
• Page End: 2225
• Publication Date: 2022-11
• Subjects: Multi-cellular L-shaped CFST -- Slender column -- Biaxial eccentric compression -- Experimental study -- Finite element analysis -- Global stability performance; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2022.10.009
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: Multi-cellular L-shaped concrete-filled steel tubular (MCL-CFST) column is an improved L-shaped CFST column, which is composed of multiple rectangular steel tubes welded by U-shaped steel plates and then filled with concrete. The global stability capacity of MCL-CFST slender columns is vital for engineering applications. However, few investigations have been carried out on the stability performance of the MCL-CFST slender columns. This paper mainly focuses on the global stability performance of MCL-CFST slender columns. Firstly, six hinged supported MCL-CFST slender columns were designed and tested under biaxial eccentric loading. The load-displacement curves, failure modes, strain development and second-order effects of MCL-CFST slender columns were reported. Then, a refined finite element (FE) model of the MCL-CFSTs was established and verified by experimental results. Moreover, based on the validated FE model, the effects of eccentricity, column height and sectional dimension on the stability performance of MCL-CFSTs under eccentric loading were investigated, and the bending resistance curves Mx / Mxu - My / Myu in two directions under various parameters were obtained. These results can provide valuable references for engineering practice.