多室式钢管混凝土组合T形截面中长柱轴压性能研究

发布时间：2018-05-08 05:03

本文选题：钢管混凝土组合柱 + T形截面　；参考：《建筑结构学报》2015年S1期

【摘要】：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。
[Abstract]:In order to study the axial compression stability of multi-chamber concrete-filled steel tubular T-shaped columns, the axial compression tests of 12 specimens of medium and long columns and 3 specimens of short columns were carried out, and the failure patterns of the specimens were analyzed. The load-deflection relationship and the effect of the aspect ratio of the specimen on the bearing capacity. The results show that the failure of medium and long columns is different from that of short columns, and the larger the aspect ratio is, the more obvious the bending failure characteristics are, and the existing constitutive model of concrete confined by square steel tubes is modified. It is introduced into the finite element software ABAQUS to simulate the test. The analysis results are in good agreement with the test results, the aspect ratio is the main factor affecting the stability of the medium and long columns, and on the basis of the test and finite element analysis, According to the regression of the finite element simulation results, the relationship between the axial stability coefficient and the slenderness ratio of multi-chamber concrete-filled steel tube composite T-shaped medium long columns is obtained, and the calculation method of the stability bearing capacity is also obtained. The calculated results are in good agreement with the experimental results, which can be used as a reference for engineering design.
【作者单位】：北京航空航天大学交通科学与工程学院;
【基金】：国家自然科学基金项目(51278019)
【分类号】：TU398.9

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