为了有效提升长柱结构在受压及地震工况中的稳定性和安全性，并进一步提高废弃混凝土的再生利用率，提出了一种内置H型钢圆钢管再生混凝土组合长柱，通过构建24个长柱模型，并应用ABAQUS有限元分析软件，以及PQ-Fiber子程序，深入研究了再生混凝土的强度、取代率以及长细比对组合长柱在轴压作用下的力学性能及水平往复作用下抗震性能的影响规律。结果表明：在轴压作用下组合长柱主要发生压弯破坏，具有良好的延性，当长细比达到39.6时，发生失稳破坏，再生混凝土强度对承载力的影响较小，随再生混凝土取代率的增大，承载力减小，当取代率达到50%后，再生混凝土取代率对承载力影响很小；长细比对组合长柱承载力的影响较大。在低周反复荷载的作用下，组合长柱均呈鼓曲破坏，其滞回曲线呈梭状，刚度退化速度较慢，表现出良好的耗能能力以及抗震性能。可见组合长柱的水平承载力和耗能能力随再生混凝土强度的提高而增大，随取代率和长细比的提高而降低；各种组合的长柱的位移延伸系数均保持在3.0~3.5的范围内，具有良好的弹塑性变形能力。

In order to effectively enhance the stability and safety of long columns under compression and seismic conditions while improving the recycling rate of waste concrete, a novel built-in H-shaped steel circular steel tube recycled concrete composite long column was proposed. By constructing 24 long column models and employing ABAQUS finite element analysis software with the PQ-Fiber subroutine, the influence patterns of recycled concrete strength, replacement ratio, and slenderness ratio on the mechanical performance under axial compression and seismic behavior under horizontal cyclic loading was investigated. The results show these as follows. Under axial compression, the composite columns primarily exhibit flexural-compressive failure with favorable ductility. Buckling failure occurs when the slenderness ratio reaches 39.6. The recycled concrete strength shows limited impact on bearing capacity, while increasing replacement ratio reduces bearing capacity-this effect diminishes significantly when replacement ratio exceeds 50%. Slenderness ratio demonstrates substantial influence on bearing capacity. Under cyclic loading, all specimens exhibit bulging failure with spindle-shaped hysteresis loops, slow stiffness degradation, and excellent energy dissipation capacity. It is concluded that the horizontal bearing capacity and energy dissipation increase with recycled concrete strength but decrease with higher replacement ratios and slenderness ratios. All configurations maintain displacement ductility coefficients between 3.0 ~ 3.5, indicating superior elastoplastic deformation capability.