中文摘要：

为研究再生粗骨料取代率对圆钢管型钢再生混凝土组合短柱轴压性能的影响,设计制作了5个组合短柱试件。通过轴心受压试验,观察组合短柱试件的受力全过程及破坏形态,获取了试件荷载-位移及荷载-应变曲线,分析再生粗骨料取代率对组合短柱承载力、刚度、延性、损伤及耗能等各项力学性能指标的影响。结果表明：在轴向荷载作用下,型钢首先发生屈服,组合短柱最终由于钢管外鼓屈曲而破坏;随着再生粗骨料取代率的增加,试件承载力逐渐降低,刚度退化较缓慢,损伤度呈现递增的趋势;延性及耗能能力增大,试件表现出较好的变形能力。综合分析建议再生粗骨料取代率取为70%。

英文摘要：

Five recycled concrete filled circular steel tube-profile steel composite short columns were designed, so as to study the influence of recycled coarse aggregate （RCA） replacement percentage on the axial compression performance of the short composite columns. Through the axial compression static load test, the whole mechanical process and failure modes of short columns were observed. The load-displacement curves and load-strain curves of short columns were also obtained. The influence of RCA replacement percentage on the bearing capacity, stiffness, ductility, damage, and energy dissipation of composite short columns was analyzed in detail. The results indicated that the profile steel yielded first and the composite short columns were failure due to the steel tube bulged under the axial load. When the RCA replacement percentage increased, the bearing capacity of short columns decreased gradually and the stiffness degenerated slowly, and the combination axial compression damage had small amplitude fluctuations. In addition, the ductility and energy dissipation capacity increased as the increase of RCA replacement percentage, which indicated that the composite short columns had good deformation. The 70% optimal replacement of recycled coarse aggregate was recommended for the composite short columns in the paper.