Abstract
The concrete-filled steel tube (CFST) columns using high-strength materials have the advantages of small sections and high capacity. However, the high-strength steel tube is susceptible to local buckling which will affect the seismic performance of CFST columns. The experimental study on seismic performance of CFRP confined rectangular CFST columns using high-strength materials indicated that the reinforcement of CFRP improves the bearing capacity and energy dissipation capacity efficiently. Based on the experimental investigation, the refined finite element model (FE model) of the CFRP confined high-strength rectangular CFST column was established in ABAQUS and verified in this paper. Parametric analysis was carried out to learn the influence of important factors such as material strength, width-to-thickness ratio, number of wrapped CFRP layers, and axial compression ratio. By combining the experimental research and parametric analysis, the restoring force model of FRP confined high-strength rectangular CFST column was proposed. The restoring force model could accurately predict the load–displacement curve and provided theoretical support for the design and application of CFRP confined high-strength rectangular CFST column.
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