中文摘要：

为了研究钢管再生混凝土短柱的轴压性能,以再生粗骨料替代率和套箍指标为主要变化参数设计了22个试件进行轴压试验,观察了试件的受力全过程和破坏形态,获取了试件的应力-应变全过程曲线,分析了骨料替代率、套箍指标对其承载性能的影响,试验结果表明：试件的破坏形态与普通钢管混凝土相似,再生粗骨料替代率对钢管再生混凝土影响不大,套箍指标对承载能力和变形性能影响明显。并分别用统一强度理论,套箍混凝土理论和叠加计算理论对试件的承载力进行了计算和分析,结果表明：统一强度理论和叠加计算理论计算值小于试验值,而套箍混凝土理论计算值略大于试验值,最后对应力-应变全过程曲线拟合分析,提出了试件的应力-应变全曲线方程。研究结果可供钢管再生混凝土短柱的科学研究和工程应用参考。

英文摘要：

In order to study the axial compress capacity of recycled aggregate concrete-filled steel tube short-columns,22 specimens were designed to test,and the recycled coarse aggregate replacement percentage and confinement index were regarded as major variable parameters.By the experiment,the whole mechanical process and failure mode of all specimens were observed,and stress-strain curves of the specimens were obtained.The influence of the aggregate replacement rate and confinement index on the bearing behaviour of the specimens was analyzed.The test results indicate that the failure mode of the columns is similar to that of an ordinary concrete-filled steel tube,and recycled coarse aggregate replacement rate has little effect on a recycled aggregate concrete-filled steel tube,but confinement index has a significant effect on the bearing behaviour and deformation performance.The bearing capacity of the specimens was calculated and analyzed according to the theories of Unified Strengthen,Confinement and Superposition Calculation.Compared with the experimental values,the results show that calculated values are low on the basis of the first and the third calculation theories,but the calculated values are slightly high based on the second calculation theory.Finally,stress-strain curves were fitted and analyzed according to experimental data.Stress-strain whole curve equations of specimens were put forward.The research conclusions could be a reference for the scientific study and engineering application of recycled aggregate concrete-filled steel tubes.