【作者】 李娟；

【导师】 蔡婧；

【作者基本信息】 西南交通大学 ， 建筑与土木工程（专业学位）， 2014， 硕士

【摘要】 索穹顶结构是一种柔性张拉整体结构,主要由拉索和压杆组成,依靠施加预应力使结构达到所设计的几何形状和结构刚度,该结构形式最大的特点就是在承受外荷载的时候,结构发生变形的同时杆件的预应力分布也随之改变,从而在变形的过程中逐步调整承载能力。跨度大、自重轻、造价低、结构受力合理及建筑造型新颖这些特点,使索穹顶在大跨空间结构形式中脱颖而出,近年来颇受关注。索穹顶的结构形式当中最经典的就是Geiger型和Levy型,也叫做肋环型和联方型,此外,还有Kiewitt型、混合型和鸟巢型。目前,国际上已有数十座建筑运用了这种结构形式且取得了较好的应用效果,积累了丰富的理论及实践经验。本文的研究内容主要有：(1)回顾了索穹顶结构的发展历程,介绍了索穹顶的分类,阐述了国内外主要的研究现状,并提出了本文的主要研究内容。(2)对一设有内拉环的肋环型索穹顶结构进行加载历程分析,分析各构件内力和节点位移随加载的变化规律。然后对其进行参数分析,研究初始预应力水平、索杆截面面积、结构矢高、压杆高度、结构跨度对受力性能的影响。(3)对上述设有内拉环的肋环型索穹顶结构进行模态分析,分析其前100阶自振频率的分布和自振振型的特点。进而对其进行参数分析,研究其自振频率和自振振型随初始预应力水平、索杆截面面积、结构矢高、压杆高度和跨度变化的规律。(4)本文还对设内拉环的肋环型索穹顶结构进行了抗震时程分析,采用水平向、竖向和三维地震输入对结构进行了多遇地震的时程分析,并对结构的位移和内力响应进行了研究。(5)优化模型并对其进行静力加载分析和模态分析。(6)总结本文的主要结论,并指出还可进一步深入的研究工作。更多还原

【Abstract】 Cable dome structures, composed of both cable in tension and struts in compression,are a kind of flexible structures in tensegrity. On the basis of being prestressed to provide geometric shape and structural stiffness. It is the greatest characteristic of the structure that the deformation of structure and distribution of prestress will change along with the load.thus its ability of bearing external force will change gradually.This type of structures, featuring in big span, light weight, economic cost, reasonable stress, ingenious design and various structural styles, etc. These characteristic make cable dome stand out in the large-span space structures and has won the highly valued in recent years. The most classic structure form of cable dome is GEIGER and LEVY, also called ribbed type and union square type, in addition, there are Kiewitt type, mixed type and the bird’s nest type. Cable dome structures have been practiced in real projects and and achieved good application effect and have therefore been mature in both theoretical researches and practical experience.In this paper, the research content are as follows:(1)First of all, based on the relevant references both in China and abroad, this article reviews cable dome structures in its developing history, the classification and structure characteristics of cable dome, and the existing conditions of both domestic and foreign researches in this area. Combined with the characteristics of ribbed cable dome structure, the first chapter outlines the main research contents and research methods of this article.(2)The analysis of static behavior of cable dome includes two parts. The first part aims to trace loading process, where variation law of axial force of each link and load-displacement curve of node are determined. The second part concerns parameter analysis, investigating their effects on the variation law of axial force of each link and load-displacement curve of node that below the center of the structure.These parameters include cable prestress,link area,structure height,strut length and structural span.(3)When analysis the dynamic properties of cable dome structure,its respective characteristic of self-vibration frequency and vibration types is firstly studied.Then, the following chapters concerns parameter analysis, these parameters are those mentioned above.(4)In addition, this article also concerns the earthquake time-history analysis. Then in the part of anti-seismic performance,horizontal seismic wave,vertical seismic wave and 3-d seismic wave have been chosen and input for time history analysis under frequent earthquakes, resulting in the structureresponse of displacement and internal force.(5)To optimize the model,then analysis the static and dynamic properties of cable dome structure.(6)In the end,the study work of this article was summarized,and the problems need to be solved in the ulterior research were indicated.更多还原