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Abstract
In this study, the mechanical performance of multicavity concrete‐filled steel tube (CFST) shear wall under axial compressive loading is investigated through experimental, numerical, and theoretical methodologies. Further, ultrasonic testing is used to assess the accumulated damage in the core concrete. Two specimens are designed for axial compression test to study the effect of concrete strength and steel ratio on the mechanical behavior of multicavity CFST shear wall. Furthermore, a three‐dimensional (3D) finite element model is established for parametric studies to probe into compound effect between multicavity steel tube and core concrete. Based on finite element simulation and limit equilibrium theory, a practical formula is proposed for calculating the axial compressive bearing capacity of the multicavity CFST shear wall, and the corresponding calculation results are found to be in good agreement with the experimental results. This indicates that the proposed formula can serve as a useful reference for engineering applications. In addition, the ultrasonic testing results revealed that the damage process of core concrete under axial load can be divided into three stages: extension of initial cracks (elastic stage), compaction due to hooping effect (elastic‐plastic stage), and overall failure of the concrete (failure stage).
Highlights
With the rapid development of high-rise buildings, steelconcrete composite structures have emerged as a new composite structure in the construction industry
Such structures are generally used to assemble beams, plates, columns, walls, etc. e steel-concrete composite structure can fully utilize the mechanical properties of steel tube and self-compacting concrete. e confining effect of steel tube on the core concrete places the concrete in a three-dimensional (3D) stress state, which significantly improves the strength, toughness, and plastic properties of the concrete
Chen [11] and Liu et al [12] suggested that concrete-filled steel tube (CFST) with a circular cross section has a strong ferrule effect, and its bearing capacity is high under axial pressure. e ferrule effect can be fully reflected when it is used for axial compression members or small biased
Summary
With the rapid development of high-rise buildings, steelconcrete composite structures have emerged as a new composite structure in the construction industry. Gan et al [25] and Zhang et al [26] studied the seismic performance of 16 sheet-concrete composite shear walls with different heightwidth ratios, axial compression ratios, steel ratio of steel plates, and structural measures. Wang et al [28] studied the influence of axial compression ratio, concrete strength, and steel plate thickness on the bending performance of multicavity CFST shear wall through experiments and finite element simulation. Erefore, it is necessary to systematically examine the failure mechanism and mechanical performance of multicavity steel tube with selfcompacting concrete shear wall and establish relevant theoretical model and design methods, which are the objectives of this study. Based on the Shantytown reconstruction project of Hongxinyuan City in Hongguang Town, China, the mechanical performance of multicavity CFST shear wall under axial compressive loading is investigated through experiments, FEA, theoretical analysis, and ultrasonic testing. Based on the Shantytown reconstruction project of Hongxinyuan City in Hongguang Town, China, the mechanical performance of multicavity CFST shear wall under axial compressive loading is investigated through experiments, FEA, theoretical analysis, and ultrasonic testing. e results can provide useful guidance for engineering design
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