Residual seismic behavior of GFRP‐rubber concrete‐hollow steel tube composite columns

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Abstract The accumulation of rubber waste has become a significant environmental challenge, prompting scholars globally to investigate effective recycling and utilization strategies. The structural application of rubber concrete presents a viable solution. This study introduces a novel Glass Fiber Reinforced Polymer steel double‐tube confined rubber concrete composite column, integrating a Displacement Steel Tubular Core. To evaluate the effect of varying rubber contents and axial compression ratios on the residual seismic behavior of these columns, pseudo‐dynamic and quasi‐static tests were performed on five specimens. Pseudo‐dynamic tests simulated seismic damage, demonstrating that the suggested composite columns demonstrate exceptional enduring seismic behavior and energy dissipation. The average ductility factor exceeds 3.5, while the mean strength degradation factor ranges from 0.95 to 0.99, ensuring post‐seismic damage ductility and load‐carrying capacity stability. Specimens with 15% rubber content demonstrated favorable ductility and high residual load‐bearing capacity and deformation capacity. Increasing the rubber content to 30% mitigates stiffness degradation but significantly reduces residual load‐bearing capacity. Optimizing axial compression boosts double‐tube confinement efficiency, enhancing post‐damage load‐bearing and energy dissipation capabilities. Finally, an approach for computing the composite skeletal framework model was devised and verified using empirical findings.