通过 6 个试件的轴心受压试验，考察了再生粗骨料取代率和截面长宽比对矩形钢管再生混凝土短柱的破坏形态、荷载－变形曲线及承载力等力学特性的影响．结果表 明: 随再生粗骨料取代率的增大，矩形钢管再生混凝土短柱的轴压承载力和组合弹性模 量及相对承载力系数减小，而后期承载力系数增大; 截面高宽比对试件相对承载力系数 变化规律的影响很小，而截面高宽比越大试件的后期承载力系数越小．在选用合理的材料 本构关系模型的基础上，建立有限元模型对矩形钢管再生混凝土短柱的轴压性能进行了模拟，总体上有限元模拟结果与试验结果吻合较好．

By performing the tests of six specimens under axial compressive loads,the effects of the replacement ra- tio of recycled coarse aggregate and the depth-to-breadth ratio of sections on the failure pattern,the load versus de- formation relationship and the bearing capacity of the rectangular recycled aggregate concrete-filled steel-tubular (ＲACFST) stub columns were investigated.The results show that,as the recycled coarse aggregate replacement ra- tio increases,the bearing capacity,the composite elastic modulus and the relative bearing capacity index of the rec- tangular RACFST specimens decrease，while the later bearing capacity index of the specimens increases,and that,the depth-to-breadth ratio has a small effect on the relative bearing capacity index of the specimens,and the later bearing capacity index of the specimens decreases with the increase of the depth-to-breadth ratio.Finally,by selec- ting a rational constitutive model of two kinds of materials,a finite element analysis model was constructed to simu- late the compressive behavior of the rectangular RACFST stub columns.It is found that the simulated results accord well with the measured ones.