Experimental and analytical investigation of square-shaped concrete-filled steel tube columns. (February 2023)

• Record Type: Journal Article
• Authors: Wu, Saifeng; Liu, Wenguang; Zhang, Jian; He, Wenfu; Guo, Yan
• Is Part Of: Journal of constructional steel research. Volume 201(2023)
• Publication Date: 2023-02
• Subjects: Concrete-filled steel tubes -- Static tests -- Stiffeners -- Tensile plates -- Diaphragms; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2022.107737
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: Square-shaped concrete-filled steel tube (CFST) columns inherit the advantages of conventional steel and concrete columns, and have been used in several super high-rise buildings. This paper presents a calculation model for square-shaped CFST columns. Based on the experimental results of a square-shaped CFST column and the application of a super high-rise building, numerical models are established to simulate the force–displacement curves of the CFST column and the stress–strain curves of square steel tubes and stiffeners, which show consistency with the experimental data. Meanwhile, the load-bearing capacity and ductility of CFST columns can be effectively increased by incorporating tensile plates, diaphragms, shear studs, and stiffeners. Considering the steel ratio, axial compression ratio, and concrete strength, nine finite element models are developed to evaluate the ductility and load-bearing capacity of the columns under the reversed-cyclic lateral load. The seismic and wind resistance properties of the structures are analyzed using a CFST column application. Highlights: A theoretical model for square-shaped CFST columns with diaphragms, shear studs, stiffeners, and tensile plates was proposed. A square-shaped CFST column was studied experimentally and numerically, and parametric analysis was carried out. The frequent earthquake and "Meranti" typhoon were analyzed for practical projects with novel and ordinary CSFT columns.