张拉膜结构的有限元数值分析与状态研究

发布时间：2018-03-16 06:15

本文选题：张拉膜结构　切入点：几何非线性　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：膜结构已经研究几十年的时间,与传统结构的力学性能相比,这种新结构有很大的不同,并且在材料、构造上也有很大不同,重量轻,覆盖面大等特点使它和其他结构不同,应用是非常广泛的。但是由于其刚度低,所以很容易发生变形。由于膜结构建筑所受到的荷载是不确定的,所以位移也是随机的产生的。过大的挠度将会引起膜结构变形、松弛、褶皱,甚至撕裂等现象,将造成严重的经济损失,探究这类膜结构形式的力学特性有助于对这类结构有更好的深入理解。国内外有不少学者通过试验或理论等方面对这类问题进行研究和分析,然而通过现有的理论并结合有限元软件数值模拟分析的比较少。通过两者分析的结果对膜结构的工程特性进行分析研究,是研究膜结构工程特性的重要课题。本文首先在两种形式的张拉膜结构施加预张力,即平面膜和双曲抛物面这两种形式,利用有限元软件ANSYS Workbench的几何非线性模块分析在施加预张力之后的基础上对两种形式的张拉膜进行受荷载变形的分析,在获得外界均布荷载作用下的膜面的变形成果之后,再将数值模拟的结果和理论结果进行对照。本文采纳的荷载形式是一种理想简化,因为研究的是膜的受荷变形后的状态,所以没有对荷载分布作特别的分析。本文得到了两种形状膜在荷载作用下其结构变形的一些结论,为膜结构的设计提供了一定的参考。
[Abstract]:The membrane structure has been studied for several decades. Compared with the mechanical properties of the traditional structure, this new structure is quite different from other structures, and it is different in material and structure, light in weight, large in coverage, and so on. The application is very extensive. But because of its low stiffness, it is easy to deform. Because the load on the membrane structure is uncertain, the displacement is also random. Excessive deflection will cause deformation of the membrane structure. Relaxation, folding, and even tearing will cause serious economic losses. Exploring the mechanical properties of this kind of membrane structure will contribute to a better understanding of this kind of structure. Many scholars at home and abroad have studied and analyzed this kind of problems by means of experiments or theories. However, few of the existing theories and finite element software are used to simulate and analyze the engineering characteristics of the membrane structure. It is an important subject to study the engineering characteristics of membrane structure. In this paper, we first apply pretension to two kinds of tensioned membrane structures, namely, plane membrane and hyperbolic paraboloid. The geometric nonlinear module of the finite element software ANSYS Workbench is used to analyze the deformation of two kinds of tension films after applying pretension. After obtaining the deformation results of the membrane surface under uniform external load, The results of the numerical simulation are compared with the theoretical results. The load form adopted in this paper is an ideal simplification, because the state of the membrane after being subjected to load and deformation is studied. Therefore, there is no special analysis of the load distribution. In this paper, some conclusions about the deformation of two kinds of membrane under load are obtained, which provides a certain reference for the design of membrane structure.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU38

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