论文部分内容阅读
为研究多室式钢管混凝土T形柱的轴压稳定性能,进行了12个中长柱试件及3个短柱试件的轴压试验,分析了试件的破坏形态、荷载-挠度关系以及试件长细比对承载力的影响。结果表明:与短柱的破坏形式不同,中长柱的破坏属于弯曲失稳破坏,长细比越大,弯曲破坏特征越明显;对已有的方形钢管约束混凝土本构模型进行了修正,并引入到有限元软件ABAQUS中,对试验进行模拟,分析结果与试验结果吻合良好;长细比是影响中长柱稳定性能的主要因素;在试验及有限元分析的基础上,确定了短柱与中长柱的界限长细比;根据有限元模拟结果的回归,得到多室式钢管混凝土组合T形中长柱轴稳定系数与长细比的关系,以及稳定承载力计算方法,计算结果和试验结果吻合较好,可供工程设计参考。
In order to study the axial compression stability of multi-cell tubular T-shaped columns, the axial compression tests of 12 long and mid-column specimens and 3 short-column specimens were carried out. The failure modes, load-deflection relationship and Effect of Slenderness on Bearing Capacity. The results show that, unlike the failure mode of the short column, the failure of the middle and long columns belongs to the buckling failure, and the greater the slenderness ratio is, the more obvious the damage characteristics are. The existing square steel tube confined concrete constitutive model is modified The finite element software ABAQUS was used to simulate the experiment. The results of the analysis are in good agreement with the experimental results. The slenderness ratio is the main factor that affects the stability of the long and medium columns. Based on the experiments and finite element analysis, According to the regression of the finite element simulation results, the relationship between the stability coefficient and the slenderness ratio of the T-shaped long-column concrete-filled steel tubular (CFST) columns is obtained, as well as the calculation method of the stability bearing capacity, the calculation results and the tests The result is in good agreement and can be used for engineering design reference.