圆钢管活性粉末混凝土柱受压极限承载力的有限元分析

发布时间：2018-04-21 21:50

本文选题：钢管活性粉末混凝土 + 有限元　；参考：《北京交通大学》2014年硕士论文

【摘要】：活性粉末混凝土是一种具有高强、高性能、高耐久性等众多优势的新型建筑材料；活性粉末混凝土与钢管结合,形成钢管活性粉末混凝土,作为受压构件时,通过发挥钢管的套箍作用,可以克服活性粉末混凝土本身脆性大的缺陷,极大提高其承载能力,具有十分广阔的应用前景。本文综合前人关于钢管活性粉末混凝土柱受压性能的试验结果,结合已有的钢管普通混凝土及钢管高强混凝土理论成果,借助大型有限元分析软件ABAQUS,对钢管活性粉末混凝土短柱和长柱在轴心及偏心荷载作用下的极限承载力进行研究,主要研究成果如下： (1)类比普通钢管混凝土的短柱极限承载力推导方法,推导了钢管活性粉末混凝土短柱的轴心受压极限承载力公式；根据材料力学关于长柱稳定承载力的计算方法,结合Euler公式,给出了钢管活性粉末混凝土长柱稳定系数和极限承载力的计算公式；分析了钢管活性粉末混凝土柱在偏心荷载作用下的受力特性。 (2)建立了钢管活性粉末混凝土短柱轴心受压模型并计算,与前人试验结果对比,论证了模型计算结果的可靠性；利用模型计算轴压短柱的极限承载力,分析加载过程中短柱的受力性能,根据模型计算结果拟合其计算公式,与现有文献中的极限承载力数据对比,说明公式的合理性。 (3)建立了钢管活性粉末混凝土长柱轴心受压模型并计算,与前人试验结果对比,论证了模型计算结果的可靠性；利用模型计算轴压长柱的极限承载力,分析长柱在轴心荷载作用下的受力性能,根据模型计算结果分析长细比对长柱极限承载力的影响,并拟合了稳定系数的计算公式。 (4)在轴压模型的基础上,建立了钢管活性粉末混凝土短柱和长柱偏心受压模型并计算,根据计算结果观察偏心荷载作用下短柱和长柱的受力性能及荷载-应变曲线、弯矩-曲率曲线的特点,分析了偏心距对短柱和长柱极限承载力的影响,结果证明,偏心距在一定范围内增加时,对极限承载力影响不大,套箍指标的增大有助于提高极限承载力及改善构件延性。 (5)本文模型的计算结果与已有试验结果较为吻合,给出的极限承载力公式能较好地贴合实际；在今后的研究中,更多的试验数据可与本文结论相互修正。
[Abstract]:Reactive powder concrete (RPC) is a new building material with many advantages, such as high strength, high performance and high durability. It is possible to overcome the defect of brittleness of reactive powder concrete (RPC) by exerting the clamping effect of steel pipe and to improve its bearing capacity greatly. It has a very broad application prospect. In this paper, the experimental results on the compressive behavior of reactive powder concrete filled steel tubular columns are summarized, combined with the existing theoretical results of ordinary concrete filled steel tube and high strength concrete filled steel tube. With the help of the finite element analysis software Abaqus, the ultimate bearing capacity of short and long columns of reactive powder concrete filled steel tube under axial and eccentric loads is studied. The main results are as follows: In this paper, the formula of axial compression ultimate bearing capacity of short column of reactive powder concrete filled steel tube is deduced, according to the calculation method of material mechanics about the stable bearing capacity of long column, the formula of Euler is combined with the method of calculating the ultimate bearing capacity of short column. The formulas for calculating the stability coefficient and ultimate bearing capacity of the long column of reactive powder concrete filled steel tube are given, and the stress characteristics of the column under eccentric load are analyzed. (2) the axial compression model of the short column of reactive powder concrete filled steel tube is established and calculated. The reliability of the model is proved by comparing with the results of previous tests, and the ultimate bearing capacity of the short column under axial compression is calculated by using the model. The mechanical behavior of the short column during loading is analyzed and the formula is fitted according to the results of the model calculation. Compared with the data of the ultimate bearing capacity in the existing literature, the rationality of the formula is demonstrated. The axial compression model of long column with reactive powder concrete filled steel tube is established and calculated. The reliability of the model is proved by comparing with the experimental results of predecessors, and the ultimate bearing capacity of long column under axial compression is calculated by using the model. The bearing behavior of long columns under axial load is analyzed, and the influence of aspect ratio on ultimate bearing capacity of long columns is analyzed according to the results of model calculation, and the formula of stability coefficient is fitted. On the basis of axial compression model, the eccentric compression models of short and long columns of reactive powder concrete filled steel tube are established and calculated. According to the calculated results, the mechanical behavior and load-strain curves of short columns and long columns under eccentric load are observed. The influence of eccentricity on the ultimate bearing capacity of short columns and long columns is analyzed. The results show that when the eccentricity increases within a certain range, the influence of eccentricity on ultimate bearing capacity is not significant. The increase of hoop index is helpful to improve ultimate bearing capacity and ductility. 5) the calculated results of the model are in good agreement with the existing experimental results, and the formula of ultimate bearing capacity can fit well with the practice, and in the future, more experimental data can be revised with the conclusion of this paper.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

【参考文献】