【作者】 徐开磊；

【导师】 刘永健；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 矩形钢管混凝土因为其具有截面抗弯刚度大、节点构造简单、与梁连接简便、易于施工等优点,目前被大量应用于实际工程当中。内置纵肋矩形钢管混凝土是一种新型结构,可提高钢管对其核心混凝土的约束作用,以及提高构件的极限承载力和延性性能,防止发生局部屈曲,改善了矩形钢管混凝土的受力性能。本文利用通用有限元程序ANSYS对内置纵肋矩形钢管混凝土轴压短柱进行了研究分析,主要完成了以下几个方面的内容：(1)对内置纵肋矩形钢管混凝土轴压短柱进行了试验研究,观察并分析了试件在整个试验过程中的变形特点、破坏模式和破坏机理。研究结果表明：纵向加劲肋能够有效防止矩形钢管混凝土壁板的局部屈曲现象,从而提高试件的极限承载力。(2)在试验研究的基础上,对内置纵肋矩形钢管混凝土轴压短柱进行了有限元模拟,同时考虑了材料非线性、几何非线性和初始缺陷对模型的影响,并将有限元分析结果与试验结果进行了对比分析,两者吻合较好。(3)通过改变加劲肋高度与壁板子板件宽度的比值,对内置纵肋矩形钢管混凝土轴压短柱进行了有限元参数分析。研究了加劲肋高度与壁板子板件宽度之比仅以及子板件宽厚比β对内置纵肋矩形钢管混凝土轴压短柱极限承载力提高系数的影响情况。(4)在参数分析的基础上,给出了计算内置纵肋矩形钢管混凝土轴压短柱极限承载力的表达式。本文的研究结论可以为今后带肋矩形钢管混凝土结构的研究提供一些参考和借鉴。更多还原

【Abstract】 Because of the strong bending-rigidity of the cross-section, simple connection details, easier to connection with beams and decoration convenience, the Rectangular Concrete-filled Steel Tubular columns (rectangular CFST) have been increasingly applied in engineering practice. Concrete-filled rectangular steel tube stub columns stiffened by inner longitudinal ribs under axial compression (stiffened rectangular CFST) is a kind of new structure, it can enhance restriction effect of the rectangular CFST to core concrete and the ultimate load carrying capacity and ductility, prevent local buckling of the steel plates, improve the mechanical performance of rectangular CFST. In this paper, stiffened rectangular CFST was studied with the universal FEM ANSYS program. The main contents are listed as follows:(1) The stiffened rectangular CFST were tested under axial compression load.The features of deformation, failure models and failure mechanism were observed and analyzed. The test results show that longitudinal stiffener can improve the local buckling performance of stiffened rectangular CFST efficiently, and can improve its ultimate load carrying capacity.(2) On the basis of the test, stiffened rectangular CFST were simulated by FEM, considering material non-linear and geometry non-linear question simultaneously, the calculating results of FEM kept in with those from tests.(3) Concrete-filled rectangular steel tube stub columns stiffened by inner longitudinal ribs under axial compression were analysised, where height-to-width ratio were selected as main varied parameters.This paper research that K is how to be influenced by parameters a andyβ.(4) Based on the analysis of parameters, the expression of ultimate load carrying capacity was given in this paper.Conclusions of this paper can provide some reference to the research of the same kind stiffened rectangular CFST in the future.更多还原