中文摘要：

【目的】采用有限元分析圆钢管型钢再生混凝土组合长柱在轴向荷载作用下的受力性能,为其工程应用提供技术支持。【方法】在前期试验的基础上,结合非线性分析理论,采用Abaqus有限元软件对圆钢管型钢再生混凝土组合长柱的轴压性能进行数值模拟,观察试件的破坏过程及特征,获取其应力云图及轴向荷载-应变曲线;并在此试验结果的基础上,对长柱进行了有限元参数拓展分析。【结果】随着钢管径厚比的增大,长柱试件承载力降幅约为6.0%,且刚度明显降低。增大型钢配钢率时,其承载力提高了4.4%左右,但延性提高明显。随着钢管和型钢强度的增大,长柱承载力提高幅度为4.3%和4.5%左右,对试件变形能力的影响不明显。此外,提高再生混凝土强度,长柱承载力提高幅度最大可达13.9%,但其延性性能降低。【结论】利用Abaqus模拟圆钢管型钢再生混凝土组合长柱的轴压受力性能是可行的,同时也表明该组合柱具有较高的承载力和良好的延性变形能力。

英文摘要：

[Objective] The mechanical performance of long columns under axial compression was stud- ied using finite element method to provide support for engineering application Of recycled concreted filled circular steel tube-profile steel long columns. [Method] Based on previous experiments and nonlinear anal- ysis theory,Abaqus software was used to simulate the axial compression behavior of long columns. The failure process and characteristics of specimens were observed. The strain nephogram and axial load-strain curves were also obtained. Then, the finite element parameter analysis of long columns was conducted. [Result] With the increase of steel tube ratio of diameter to thickness,the bearing capacity of long column decreased by 6.0% and stiffness reduced significantly. Increasing steel ratio increased bearing capacity by 4.4 % and improved ductility significantly. With the increase of the strength of steel tube and profile steel, bearing capacity of long columns increased by 4.3 % and 4.5 %, while the influence on deformation of col- umns was slight. With the increase of recycled concrete strength, the bearing cagacitv of columns was in-creased by 13.9 % ,while ductility was decreased. [Conclusion] Using Abaqus software to simulate the me- chanical performance of recycled concrete filled circular steel tube-profile steel long columns is feasible and the columns have high bearing capacity and good ductility.