article · Structural Concrete
This research presents a fiber element analysis model designed to simulate the structural responses of square steel-reinforced concrete-filled steel tubular (SRCFST) short columns when subjected to concentric compression, specifically incorporating local buckling effects. The model uses the method of effective widths to represent the gradual post-local buckling behaviour of the steel tube walls. A new confinement model for concrete was developed based on experimental results, accounting for the confinement provided by the embedded steel section. This new confinement model was integrated into the fiber model and its accuracy was verified through experiments. The study also evaluated the suitability of existing confinement models and design formulas for concrete-filled steel tubular (CFST) columns when applied to SRCFST columns. A new formula is proposed to predict the strength of SRCFST short columns, with the developed models and formula demonstrating good accuracy in performance predictions.
This research improves the understanding and prediction of how specific types of reinforced concrete columns behave under stress. This is important for designing safer and more reliable buildings and structures, particularly those utilising steel-reinforced concrete-filled steel tubular columns. Accurate models help engineers ensure structural integrity and optimise material use.
The developed inelastic simulation model, confinement model, and design formula could be used by structural engineers and construction companies to more accurately design and assess square steel-reinforced concrete-filled steel tubular short columns. This is applied research, providing tools that could enhance the safety and efficiency of structural design in the construction industry, moving towards more reliable and optimised building practices.
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Abstract This paper presents a fiber element analysis model that simulates the structural responses of square steel‐reinforced concrete‐filled steel tubular (SRCFST) short columns under concentric compression including local buckling effects. The method of effective widths is utilized to model the gradual postlocal buckling of the steel tube walls of a SRCFST column loaded axially to failure. A new confinement model is developed for the concrete based on test results, considering the confinement induced by the embedded steel section. This confinement model is incorporated into the fiber model, and its accuracy is verified by experimental results. The accuracy of various confinement models proposed for concrete‐filled steel tubular (CFST) square columns in predicting the performance of SRCFST columns is evaluated. A parametric study is performed to investigate the performance of SRCFST columns with various parameters. The applicability of the design formulas specified in current standards for CFST columns to the design of SRCFST columns is examined. A formula is proposed to predict the strength of SRCFST short columns. The developed inelastic simulation model, confinement model, and design formula are found to yield performance predictions of SRCFST columns with good accuracy.
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DOI: 10.1002/suco.202300402
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