【摘要】 为研究矩形钢管混凝土中长柱的轴压性能，基于合理的混凝土和钢材本构模型，采用有限元软件ABAQUS建立三维实体精细化足尺中长柱有限元模型，该模型考虑钢管与混凝土之间相互作用、初始缺陷。试验结果验证了该方法的准确性。在此基础上，全面分析了中长柱加载过程的变形规律，详细考察了中长柱破坏模式，进而揭示了矩形钢管与核心混凝土之间的相互作用。最后，探讨了混凝土强度、钢材屈服强度、截面含钢率、截面长宽比以及长细比对矩形钢管混凝土轴压中长柱稳定系数的影响。研究表明：长细比对矩形钢管混凝土中长柱稳定性影响较大，其次是截面含钢率，而混凝土强度、钢材屈服强度和截面长宽比的影响非常小，可忽略不计。更多还原

【Abstract】 In order to investigale the uxial compressive behavior of concrete-filled rectangular steel tube mid-long column, based on the reasonable constitutive model of concrete and steel, the finite element(FE) program ABAQUS is used to establish the full-scale finite element(FE) models of mid-long columns, which considers the interaction betmeen steel tube and concrete and the initial defects. The accuracy of FE models is verified by the test results.On this basis, the full curves analysis on the load vs. displacement curves during the load process is investigated the failure modes of mid-long column is investigated in detail, and the interaction between the rectangular steel tube and the core concrete is revealed.Finally, the parametric studies are carried out, including the concrete strength, steel strength, steel ratio, aspect ratio, and slenderness ratio.The study shows that the stability coeffient of mid-long columns is obriously influenced by the slenderness ratio, and followe by the steel ratio, while the effect of concrete strength and steel strength is very small and negligible.更多还原