六杆四面体单元组成的新型装配式球面网壳理论与试验研究

发布时间：2018-04-20 20:44

本文选题：六杆四面体单元 + 球面网壳　；参考：《浙江大学》2015年博士论文

【摘要】：随着我国经济社会的快速发展,传统建筑业粗放的生产、建造方式与资源、环境之间的矛盾日趋激化。在这一背景下,促进建筑产业由粗放型向集约型发展、推动建筑工业化进程,成为我国建筑业发展的必然方向。国内外经验表明,建筑工业化的首要任务是开发具有工业化属性的建筑结构体系,否则一切工作都只能是空中楼阁。本文的研究对象是一种新型球面网壳结构,它由一系列平面投影为四边形的六杆四面体模数单元组成,构形简单且规律性强,非常适合标准化设计、工业化生产和装配化施工,是一种典型的面向建筑工业化时代的空间结构体系。文中从理论和实践角度对这种球面网壳结构展开了研究,希望能藉此为我国的建筑工业化进程提供一套成熟、可行的空间网格结构新体系。第1章对网壳结构体系及计算分析方法的发展现状进行了总结,介绍了国内外在装配式空间网格结构方面的实践情况。从我国建筑产业发展现状出发,阐明了当前研发新型装配式建筑结构体系的意义,并明确了本文的研究内容。第2章从组成球面网壳的六杆四面体基本模数单元的特点出发,探讨了它与传统三角锥单元的异同。针对基本单元上弦杆沿球面经线方向布置的球面网壳,提炼出了决定结构形态的关键几何参数。根据是否在网壳顶部开口处设置封口内环杆,定义了球面网壳的有内环杆和无内环杆基本结构体系。通过发掘基本单元不同的排布方式,还对六杆四面体单元可能组成的其他网壳结构做了探讨。第3章分别基于Maxwell准则和平衡矩阵理论对六杆四面体单元组成的球面网壳的全铰接基本结构体系进行了机动分析,通过对体系平衡矩阵进行一系列初等变换,结合平衡矩阵的物理意义,对分析结果进行了严格证明。同时还从理论角度给出了网壳加强结构体系和不同节点刚性布置方案的形成方式及依据。第4章为球面网壳静力性能的分析研究。静力分析的主要内容是对网壳结构的强度和刚度进行验算,以此来反映结构在承受一定外荷载时所表现出的内力和位移分布特点。研究中考虑了球面网壳的基本结构体系和两个加强结构体系,以及每种结构体系下四种节点刚性布置方案,从横向和纵向两个层面展开对比分析。文中还以球面网壳的关键几何参数为变量进行了参数分析。第5章对球面网壳的稳定性能进行了系统的分析考察。首先提出了一种能考虑杆件失稳影响的稳定分析思路,并解决了在整体结构分析中体现杆元稳定性的问题。随后利用该方法建立了球面网壳的有限元模型,并进行了特征值屈曲分析以及考虑杆件失稳和初始缺陷的几何、材料双重非线性分析。最后针对网壳的稳定性能进行了参数分析。第6章从工程应用的角度出发,针对球面网壳一个比较适合工程应用的节点刚性布置方案给出了具体的节点构造形式。基于所提出的节点构造和球面网壳的构形特点,提出一种高空悬臂无脚手的装配化施工方案,并设计了施工中所需的辅助构件。最后还研究了针对所提出施工方案的全过程内力分析方法,并将这种方法得到的结果与常规满堂红脚手架施工方案在落架时的结构内力分布进行了对比。第7章在前面各章所做的理论工作基础上,对六杆四面体单元组成的球面网壳进行了模型试验研究。首先基于一个10米跨度的大型实物模型,对球面网壳的工业化生产和装配化施工进行了实践,分析、总结了实践中存在的问题。然后对模型的安装精度进行了测量,利用测得的节点坐标重建了有限元模型,从理论上考察了安装误差对结构静力特性的影响。最后对模型进行了静力加载测试,将测试结果与实际模型的有限元计算结果进行了对比,分析了误差来源及其对结构静力性能的影响机理。第8章对本文研究所得结论进行了总结,并指出了下一步的研究方向。
[Abstract]:With the rapid development of our country's economy and society, the contradiction between the extensive production of traditional construction industry, the construction mode and the resources and the environment is becoming more and more intense. In this context, it is an inevitable direction for the construction industry to promote the construction industry from extensive to intensive development and to promote the process of construction industrialization. The primary task of the industrialization is to develop a building structure system with industrial properties. Otherwise, all work can only be a castle in the air. The object of this paper is a new type of spherical reticulated shell. It is composed of a series of six bar tetrahedral modulus units which are projected into quadrangles by a series of planes, which are simple and regular. It is very suitable for standardization. Industrial production and assembly construction are a typical spatial structure system facing the era of architectural industrialization. This paper studies the spherical reticulated shell structure from the theoretical and practical perspectives, hoping to provide a mature and feasible new system of space grid structure for the process of building industrialization in China.
In the first chapter, the development status of the structure system and the method of calculation and analysis of the reticulated shell is summarized, and the practical situation of the assembly space grid structure at home and abroad is introduced. From the current situation of the development of the building industry in China, the meaning of the current research and development of the new type of assembly architecture system is clarified, and the content of this paper is clearly defined.
In the second chapter, based on the characteristics of the basic modulus unit of the six bar tetrahedron, which consists of a spherical reticulated shell, the similarities and differences with the traditional triangular cone unit are discussed. The key geometric parameters determining the structure form are extracted for the spherical reticulated shell arranged along the direction of the spherical meridian along the sphere of the basic unit. The inner ring bar and the basic structure system of a spherical reticulated shell with inner ring and no inner ring are defined. The structure of other reticulated shells which may be composed of six bar tetrahedron elements is also discussed by exploring the different layout methods of the basic units.
In the third chapter, based on the Maxwell criterion and the equilibrium matrix theory, the full hinged basic structure system of the spherical reticulated shell composed of six rod tetrahedral elements is analyzed. A series of elementary transformations are carried out on the system equilibrium matrix and the physical meaning of the equilibrium matrix is combined to prove the results of the analysis strictly. The form and basis of the reticulated shell reinforcement system and the rigid layout scheme of different joints are given.
The fourth chapter is the analysis and study of static performance of spherical reticulated shell. The main content of static analysis is to check the strength and stiffness of the reticulated shell structure to reflect the characteristics of the internal force and displacement distribution when the structure is subjected to a certain external load. In the study, the basic structure system and two strengthening structural systems of the spherical reticulated shell are considered in the study. And the four rigid layout schemes for each structure system are analyzed from two aspects of transverse and longitudinal. The parameters of the key geometric parameters of the spherical reticulated shell are analyzed in this paper.
In the fifth chapter, the stability of the spherical reticulated shell is systematically analyzed. First, a stable analysis method which can consider the effect of the instability of the rod is proposed, and the problem of the stability of the rod element is solved in the analysis of the whole structure. Then the finite element model of the spherical reticulated shell is established by the method, and the eigenvalue buckling analysis is carried out. And the geometric and material dual nonlinear analysis considering the instability and initial defects of the rod. Finally, the stability analysis of the reticulated shell is carried out.
From the point of view of engineering application, the sixth chapter gives a concrete form of node structure for a spherical reticulated shell which is suitable for engineering application. Based on the proposed node structure and the configuration characteristics of the spherical reticulated shell, a installation and matching construction scheme for the high altitude cantilever hand free hand is proposed, and the necessary construction is designed. In the end, the whole process internal force analysis method for the proposed construction scheme is also studied, and the results obtained by this method are compared with the structural internal force distribution of the conventional full red scaffold construction scheme in the falling frame.
The seventh chapter, based on the theoretical work done in the preceding chapters, carries out a model test study on the spherical reticulated shell composed of six tetrahedron units. First, based on a large physical model of a 10 meter span, the industrial production and assembly construction of the spherical reticulated shell are practiced and analyzed, and the problems in the practice are summarized. The installation accuracy of the type is measured. The finite element model is rebuilt by the measured node coordinates. The influence of the installation error on the static characteristics of the structure is investigated theoretically. Finally, the static loading test is carried out on the model. The result of the test is compared with the finite element calculation results of the actual model, and the source of the error and its structure are analyzed. The influence mechanism of static performance.
The eighth chapter summarizes the conclusions and points out the next research direction.

【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU399

【参考文献】