Seismic research on column base joint of L-shaped CFST columns under cyclic loading. (November 2022)

• Record Type: Journal Article
• Authors: Chen, Zhihua; Xu, Jiahang; Zhou, Ting; Su, Jing
• Is Part Of: Structures. Volume 45(2022)
• Page Start: 1212
• Page End: 1224
• Publication Date: 2022-11
• Subjects: Exposed column base -- Concrete-filled steel tube -- Seismic behavior -- Parametric analysis -- Simplified strength model; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2022.09.095
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: The newly exposed column base (ECB) for L-shaped concrete-filled steel tube (CFST) columns investigated in this study consists of an outer base plate, a concrete cushion, and anchor bolts. Three ECB specimens of the L-shaped CFST column were tested under constant axial loading and cyclic horizontal loading to investigate their seismic behavior. The failure mode, moment versus rotation relationship, hysteretic behavior, and ultimate moment strength were analyzed. The test results indicated that the failure mode of ECB is the failure of the concrete cushion and yielding of the base plate and anchor bolts. Furthermore, a parametric analysis based on a verified finite element model was performed to investigate the influence of various parameters on the ultimate moment strength. Finally, a simplified strength model of ECB for L-shaped CFST based on the composite yielding method was proposed.