中文摘要：

为研究钢骨-钢管高强混凝土新型组合柱的抗弯力学性能,采用ABAQUS软件对钢骨-圆钢管高强混凝土组合柱纯弯力学性能进行有限元分析,得到了典型组合柱纯弯试件的荷载-挠度关系曲线,不同受力阶段的应力分布规律以及破坏模态,同时考虑不同参数对组合柱抗弯力学性能的影响,探讨了钢骨-圆钢管高强混凝土组合柱抗弯承载力实用计算方法,提出简化计算式,并将简化式计算结果与有限元及试验结果进行对比。最后用MATLAB编写了组合柱纯弯纤维模型法计算源程序,并将程序计算的弯矩-跨中挠度曲线与试验结果及有限元结果进行比较。结果表明：简化式计算结果与试验及有限元计算结果吻合良好,数值模型能较好地反映组合柱纯弯受力的弯矩-挠度曲线。

英文摘要：

In order to study mechanical properties of circular steel tube filled with steel-reinforced high-strength concrete slender composite column under pure bending,the nonlinear finite element analysis of the composite columns under pure bending was conducted by the software ABAQUS. The characteristics of load-deformation relationship of all the pure bending specimens were analyzed,as well as the corresponding stress distribution laws and failure modes in different loading stages.At the same time,the influence of different parameters on the flexural mechanical properties of the composite columns was also studied. Some practical calculation methods for the flexural bearing capacity of the steel tubular composite columns filled with cross-steel reinforced high strength concrete were discussed,and the simplified formula calculated results were compared with FEM results and test results. Finally,a calculation source program for the fiber model method based on composite column under pure bending was written by MATLAB. The bending moment versus mid-span deflection curves calculated by fiber model method were compared with the test and FEM results. It was shown that the results obtained by practical calculation method were in good agreement with the test and FEM results. Fiber model method can accurately reflect the moment versus deflection curves of the composite columns under pure bending.