钢管混凝土柱构件稳定性研究

发布时间：2018-02-01 17:05

本文关键词： 钢管混凝土柱 ANSYS 稳定性承载力　出处：《南昌航空大学》2017年硕士论文　论文类型：学位论文

【摘要】：钢管混凝土柱能充分发挥钢管和混凝土两种材料的优点,具有承载能力高、实用、经济、美观等优点。目前已广泛应用于工程实践中,国内外许多学者对钢管混凝土力学性能和设计方法进行了大量的研究。但随着钢管厚度越来越薄的趋势,当轴向压力较大时,构件很容易发生失稳,这就大大降低了整个构件的承载能力。本文利用ANSYS有限元软件建立钢管混凝土柱模型,对钢管混凝土柱构件进行了大量的参数分析,得到影响构件稳定性的主要因素,并建立比较稳定的承载力公式,具体内容如下:(1)探讨有限元ANSYS在模拟钢管混凝土时需要解决的一些主要问题,如混凝土和钢管单元类型的选择、混凝土本构关系的确定、网格密度的划分、荷载施加的方式、并确定本文所采用的方法。(2)以方形和圆形钢管混凝土短柱为研究对象,研究了不同参数对构件稳定性的影响,得到影响钢管混凝土短柱稳定承载力的主要因素。参数的影响可以反映到约束效应系数?上,最后总结轴心受压时钢管混凝土短柱的稳定承载力公式,并与国内外公式进行比较,吻合较好。(3)在短柱研究的基础上,对圆钢管混凝土长柱的稳定性也进行了有限元分析,通过分析不同的混凝土强度、钢材屈服强度、构件长细比等因素的影响,得到长细比是影响长柱稳定性的主要因素;最后以短柱为基础,建立了长柱的稳定承载力公式。(4)对圆形钢管混凝土长柱的稳定性能与其对应的空钢管柱局部稳定性能进行了分析比较。研究表明:钢管混凝土柱中由于内填混凝土的存在,钢管混凝土柱比同等条件下的空钢管柱承载力提高约30%,钢管混凝土柱不容易发生侧向屈曲,侧向挠度发展较慢。
[Abstract]:Concrete-filled steel tubular columns can give full play to the advantages of steel tube and concrete, with high bearing capacity, practical, economic, beautiful and so on. At present, they have been widely used in engineering practice. Many scholars at home and abroad have done a lot of research on the mechanical properties and design methods of concrete-filled steel tubular (CFST). However, with the trend of steel tube thickness becoming thinner and thinner, when the axial pressure is larger, members are prone to instability. This greatly reduces the bearing capacity of the whole member. In this paper, the ANSYS finite element software is used to establish the CFST column model, and a large number of parameters are analyzed. The main factors affecting the stability of the members are obtained, and a relatively stable bearing capacity formula is established. The concrete contents are as follows: 1) the main problems that need to be solved when the finite element ANSYS is used to simulate concrete filled steel tube (CFST) are discussed. For example, the choice of concrete and steel pipe element type, the determination of concrete constitutive relation, the division of grid density, the way of loading. And determine the method adopted in this paper. (2) take square and circular short columns of concrete-filled steel tube as the research object, and study the influence of different parameters on the stability of the members. The main factors affecting the stability of concrete filled steel tubular columns are obtained. Finally, the formula of stability bearing capacity of concrete-filled steel tubular column under axial compression is summarized, and compared with the formula at home and abroad, it is in good agreement with the short column on the basis of the research. The stability of concrete-filled circular steel tubular columns is also analyzed by finite element method. The influence of different concrete strength, steel yield strength, aspect ratio of members and other factors are analyzed. The aspect ratio is the main factor affecting the stability of the long column. Finally, it is based on a short column. The stable bearing capacity formula of long columns is established. The stability performance of circular concrete-filled steel tubular columns is analyzed and compared with that of the corresponding hollow steel tubular columns. The results show that the concrete filled steel tubular columns are due to the existence of inner filled concrete. Compared with the same condition, the bearing capacity of CFST columns is increased by about 30%. The CFST columns are not prone to lateral buckling and the lateral deflection development is slower than that of CFST columns under the same conditions.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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