Experimental and finite element study on seismic performance of the LCFST-D columns. (October 2017)

• Record Type: Journal Article
• Authors: Xiong, Qingqing; Chen, Zhihua; Kang, Jingfu; Zhou, Ting; Zhang, Wang
• Is Part Of: Journal of constructional steel research. Volume 137(2017)
• Page Start: 119
• Page End: 134
• Publication Date: 2017-10
• Subjects: L-shaped column composed of concrete-filled steel tube mono-columns (L-CFST column) -- Double vertical steel plates -- Experimental study -- Seismic performance -- High-rise steel structure residential building; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2017.06.002
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: In this paper, special-shaped columns composed of concrete-filled steel tube mono-columns connected by double vertical steel plates (LCFST-D) are proposed. Five specimens were tested under a constant axial force and cyclic lateral loading. The variables studied in the experiments include the axial compression ratio, sectional dimensions of the mono-column, and the width and thickness of the vertical steel plates. The specimens behaved in a ductile manner and experienced stable hysteresis behaviour before failing in a sequence involving local buckling at the base of the side mono-column, compressive crushing of concrete at the base of the side mono-column, and fracture propagation at the boundary between the side and central mono-column. The seismic behaviour of the specimens was evaluated in terms of strength, stiffness, deformation, ductility, energy dissipation capacity, and strain distribution. Based on the experiments conducted on these LCFST-D columns under cyclic loading, 3-D nonlinear element models were used to analyse the mechanical properties and seismic behaviour of LCFST-D columns. The results of this finite element analysis showed good agreement with the experiment results. Overall, the seismic behaviour of the LCFST-D column was significantly better than the behaviour of L-shaped columns composed of concrete-filled steel tube mono-columns connected by a single vertical steel plate (LCFST-S). Additionally, it was found that the mono-columns worked more cooperatively in the LCFST-D column arrangement. The research presented in this paper provides a basis for the application of LCFST-D column structural systems in high-rise steel buildings. Highlights: A new kind of LCFST-D column is put forward. A low-frequency cyclic loading test of five LCFST-D columns is conducted. The seismic behaviour of five LCFST-D columns is analyzed by FEM and experiment. The seismic performance between LCFST-S and LCFST-D columns is compared.