Structural Performance and Seismic Damage Modeling of Aluminum Alloy Tube–Concrete Composite Columns
Abstract
Abstract This study investigates the axial compression behavior and seismic performance of aluminum alloy tube–concrete long columns through refined finite element analysis and cyclic loading simulations. A validated numerical modeling framework is established to capture the confinement effect of aluminum alloy tubes and the nonlinear interaction between aluminum alloy and concrete. The failure mechanisms of square and circular section columns are systematically analyzed, revealing that square-section specimens are governed by global flexural instability induced by end buckling, while circular-section specimens exhibit elastic–plastic instability caused by excessive mid-span deformation. Parametric studies demonstrate that increasing tube wall thickness and cross-sectional size significantly enhances load-bearing capacity and ductility, whereas the influence of concrete strength and slenderness ratio is relatively limited within the investigated range. Under low-cycle reversed loading, the columns display stable hysteretic behavior with favorable energy dissipation and deformation capacity. Furthermore, a machine-learning-enhanced seismic damage model is proposed to evaluate damage evolution. Compared with the conventional Park–Ang model, the improved model provides a more accurate representation of nonlinear damage progression and offers improved applicability for aluminum alloy tube–concrete long columns. The results provide useful insights for the design and seismic…
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