Benchmarking OpenSees Model Against Experimental Results for Axial Behaviour of CFST Columns
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This study provides an in‑depth assessment of the axial response of Circular Concrete-Filled Steel Tubular (CFST) columns using a new model implemented in OpenSees. The effectiveness and predictive accuracy of these OpenSees-based models are examined against a large experimental database comprising more than seven hundred test results, including noncompact and slender sections as well as specimens incorporating high-strength materials. A concise overview of the specific OpenSees model employed for concrete, steel, and confinement effects is presented. The comparative evaluation demonstrates that OpenSees modelling captures the axial compression behaviour of CFST columns with satisfactory fidelity across a wide range of geometrical and material parameters. Furthermore, a parametric investigation is conducted to identify the modelling configurations that provide the highest accuracy for different slenderness ratios and material strength levels. The outcomes of this research offer designers and researchers clear guidance on selecting appropriate OpenSees modelling strategies for reliable analysis and design of CFST members.