In this tutorial, we simulate an elliptical ultra‑high‑performance concrete‑filled steel tubular (CFST) column under compression load in Abaqus. Elliptical CFST columns have gained attention because they offer higher strength and stiffness compared with empty elliptical hollow sections.
The UHPC core is modeled as a three‑dimensional solid part, while the steel tube is modeled as a three‑dimensional shell. Concrete‑filled steel tubular columns are widely used in buildings, bridge piers, transmission towers, and offshore structures due to their high strength, stiffness, ductility, and energy absorption capacity. Elliptical CFST columns are a newer type of composite column formed by filling an elliptical hollow steel tube with concrete.
The Concrete Damaged Plasticity (CDP) model is used to represent UHPC behavior, with material data taken from a reference paper. The steel tube is defined as an elastic‑plastic material with a ductile damage criterion. A general static step is used, with adjustments to improve convergence.
Perfect contact is assumed between the steel tube and the concrete core. General contact with defined contact properties is applied to all parts. The bottom rigid body is fixed, and a displacement‑controlled load with an amplitude curve is applied to the top rigid body. A fine mesh is required to obtain accurate results.
After running the analysis, users can extract stress, strain, damage variables, force–displacement curves, and other key results. Example result figures are shown below.
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