Abstract
The mechanical properties of T-shaped concrete-filled steel tubular (TCFST) short columns under axial compression after elevated temperature are investigated in this paper. A total of 30 TCFST short columns with different temperature (T), steel ratio (α), and duration of heating (t) were tested. The TCFST column was directly fabricated by welding two rectangular steel tubes together. The study mainly investigated the failure modes, the ultimate bearing capacity, the load-displacement, and the load-strain performance of the TCFST short columns. Experimental results indicate that the rectangular steel tubes of the TCFST column have deformation consistency, and the failure mode consists of local crack, drum damage, and shear failure. Additionally, the influence of high temperature on the residual bearing capacity of the TCFST is significant, e.g., a higher temperature can downgrade the ultimate bearing capacity. Finally, a finite element model (FEM) is developed to simulate the performance of the TCFST short columns under elevated temperature, and the results agree with experimental values well. Overall, this investigation can provide some guidance for future studies on damage assessment and reinforcement of the TCFST columns.
Highlights
As one of the main components of buildings, concretefilled steel tube (CFST) column has several advantages such as high rigidity, high strength, large capacity of energy absorption, and high ductility [1,2,3]
Yong et al [17] researched the performance of the CFST column under the fire effect, and results revealed that thicker coating could enhance fire-resistance while a larger axial compression ratio made the opposite effect
Mahsa et al [18] investigated the effect of elevated temperature on the mechanical properties of the ordinary concrete and steel-concrete composite structures, and they demonstrated that predeformation failed at high temperature
Summary
As one of the main components of buildings, concretefilled steel tube (CFST) column has several advantages such as high rigidity, high strength, large capacity of energy absorption, and high ductility [1,2,3]. Us, some researchers have conducted many experimental investigations on the mechanical properties ( the fire-resist performance and the residual bearing capacity) of CFST under elevated temperature [13, 14] and low temperature [15, 16]. Liu et al [35] conducted axial compression experiments on the L-shaped and T-shaped CFST short columns, and experimental results revealed that the reinforced ribs could effectively prevent the local buckling of the steel tube and increase the buckling ability. A large number of researchers have studied the mechanical properties of ordinary CFST column at different temperatures, or the experimental study of specialshaped CFST column at ambient temperature, but few studies focus on the property of the special-shaped CFST short column at elevated temperature. The experiment results are compared with numerical results obtained by finite element software. e investigations in this paper provide great guidance for fast repairing of building structures and reducing the economic loss after fire
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