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Numerical Investigation of Concrete Filled Double Circular Steel Tube Columns Using CFD


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DOI: https://doi.org/10.15866/irece.v14i6.23356

Abstract


In the present investigation, a CFD model is proposed for the analysis of concrete filled double circular steel tube columns under axial load and eccentric load conditions. A numerical model using CFD was used for the development of the study. The investigation involves the evaluation of the geometrical characteristics (diameter and thickness) of the inner circular tube and outer circular tube, material properties, and the effect of the change of cross section. The results demonstrate that adding an inner circular tube in the concentric column causes a significant improvement in the ultimate strength and ductility compared to the steel tubular columns filled with concrete. An increase of 6.64% in the ultimate axial load resistance is evidenced. The largest diameter and thickness of the inner and outer tubes lead to higher strength in the CFDCST columns. The results indicate an increase of 16.53% and 25.96% in the maximum axial load resistance with an increase in the diameter and thickness of the steel inner tube. In the case of the outer tube, an increase of 52.47% and 32.37% is observed, respectively. Circular section columns with steel inner tube show an increase of 16.57% in the ultimate axial load compared to rectangular section columns. In general, the proposed methodology represents a suitable way for the evaluation of different geometrical configurations with CFDCST columns.
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Keywords


Ultimate Strength; Steel Tube Column; Numerical Model; Concrete Filled

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References


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