摘   要：研究了不同再生骨料替代率下，不锈钢管与钢纤维增强再生混凝土组合柱的轴压性能，获得了试件的破坏形态、荷载-位移曲线和轴压刚度。结果表明：根据荷载-位移曲线的变化特征，可将试件按承载力稳定性分为不稳定和稳定两类；不稳定试件峰值荷载后的荷载-位移曲线快速探底，此后荷载开始缓慢提升，轴向变形快速增大；稳定试件峰值荷载后的荷载-位移曲线沿水平方向发展，试件的持荷能力突出；试件的轴压刚度在0.3~0.9倍的峰值荷载时达到最大，此时钢与混凝土的材料损伤相对较小，钢管对混凝土的约束效应相对有效；随着再生骨料替代率的增大，试件的轴压刚度逐渐降低；钢纤维抑制了裂缝的发展，维护了混凝土的整体性，从而提高了试件的轴压刚度。

Abstract： The axial compression performance of stainless steel pipe and steel fiber reinforced recycled concrete composite columns with different recycled aggregate replacement rates was studied, and the failure mode, load-displacement curve and axial compression stiffness were obtained. The results show that according to the characteristics of load-displacement curve, the specimens can be divided into unstable and stable types according to the bearing capacity stability. The load-displacement curve of the unstable specimen after the peak load quickly reaches the bottom, after which the load starts to increase slowly, and the axial deformation increases rapidly. The load-displacement curve of the stable specimen  after the peak load develops in the horizontal direction, and the load-holding capacity of the specimen is outstanding. The axial compression stiffness of the specimen reaches the maximum when the load is 0.3~0.9 times of the peak load, and at this time, the material damage of steel and concrete is relatively small, and the restraint effect of steel pipe on concrete is relatively effective. With the increase of the replacement rate of recycled aggregate, the axial compression stiffness of the specimen decreases gradually. The steel fiber inhibits the development of cracks and maintains the integrity of the concrete, thereby improving the axial stiffness of the specimen.