Finite-Element Modeling of Concrete-Filled Steel Tubular Columns under Axial Compression

Concrete-filled steel tubular (CFST) structures involve pouring concrete into steel tubes, which exert a constraining role, significantly enhancing the ductility of the concrete. Such structures are gaining popularity in engineering projects. This study analyzes the steel formwork concrete column that employs a thin-walled form based on previous research on CFST structures. It considers many factors, such as concrete strength, reinforcement diameter, and width-to-thickness ratios, to address the deficiencies in the experimental design scheme through numerical simulation. In addition, standard formulas for existing composite structures are employed to determine the ultimate capacity of the components. The results demonstrated a general consistency in predicted mechanical property outcomes between the nonlinear finite-element analysis and the theoretical calculation.