单层球面网壳非均匀荷载作用下的动力稳定性研究

发布时间：2018-02-09 03:44

本文关键词： 单层球面网壳非均匀荷载动力稳定性地震作用几何缺陷　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：几十年来,随着人民生活水平的不断提高,社会大踏步的发展以及科学技术的革新与进步,空间结构也得到了更快速的发展与更广泛的应用。现阶段,空间结构越来越多地应用于大型体育场馆、会展中心、机场机库、大型娱乐场所等公共建筑,并且跨度不断增大,结构形式也不断创新。而空间网壳结构更是以其独特的结构优势及良好的视觉效果受到人们的青睐。网壳结构作为空间网格结构的一种,其外表面是曲面的,所以其既具有薄壳结构的受力合理的特点,又具有杆系结构构造简单、制作方便的特点,同时还能形成天然的排水面。由于网壳结构承受的的大部分荷载都通过其杆件的轴向力传递,加上其类似“薄膜”作用的受力特征,所以网壳结构也存在稳定问题。现阶段,网壳结构的静力稳定研究已经相对比较成熟,然而其动力稳定方面的研究还不够全面,再考虑到网壳结构在日常使用中遭受的荷载很可能是非均匀的,所以本文就着重研究单层球面网壳非均匀荷载作用下的动力稳定问题。为了研究单层球面网壳在均匀和非均匀荷载作用下的动力稳定性,本文基于全过程非线性动力反应时程分析方法,运用实用的动力稳定性判定准则,以联方型单层球面网壳结构为研究对象,采用有限元分析软件ANSYS进行模型建立,考虑满跨均布荷载、满跨不对称荷载和半跨不对称荷载三种荷载工况,以不同地震波(EL-Centro波、Taft波、天津波)、不同地震输入维数(水平、竖向、三向)、矢跨比、杆件截面面积和初始几何缺陷为参数,系统分析了其在地震作用下的动力稳定性,得出了一些有意义的结论,为网壳结构的实际工程设计提供参考。
[Abstract]:Over the past decades, with the continuous improvement of people's living standards, the rapid development of society and the innovation and progress of science and technology, the space structure has also been developed more rapidly and applied more widely. Spatial structures are increasingly used in public buildings such as large stadiums, convention and exhibition centers, airport hangars, large entertainment places and so on. The space reticulated shell structure is favored by people because of its unique structural advantages and good visual effect. As a kind of spatial grid structure, the outer surface of the reticulated shell structure is curved. Therefore, it not only has the characteristics of reasonable force of thin shell structure, but also has the characteristics of simple structure of bar system structure and convenient manufacture. At the same time, it can also form a natural drainage surface. Since most of the loads borne by the latticed shell structure are transmitted through the axial force of its members, and the mechanical characteristics of the latticed shell structure are similar to the "membrane" action, there is also a problem of stability of the latticed shell structure at this stage. The study on static stability of latticed shell structures is relatively mature, but the study on dynamic stability of latticed shell structures is not comprehensive enough, and considering that the loads on latticed shell structures in daily use are likely to be non-uniform. In order to study the dynamic stability of single-layer spherical latticed shells under uniform and non-uniform loads, the dynamic stability of single-layer spherical latticed shells is studied in this paper. In this paper, based on the time-history analysis method of nonlinear dynamic response of the whole process, using the practical criterion of dynamic stability, taking the single-layer spherical latticed shell with square shape as the research object, the finite element analysis software ANSYS is used to build the model. Considering three load conditions: full span uniform load, full span asymmetric load and half span asymmetric load, different seismic waves such as EL-Centro wave and Taft wave, Tianjin wave, different earthquake input dimensions (horizontal, vertical, triaxial, rise-span ratio) are considered. The dynamic stability of bars subjected to earthquake is systematically analyzed and some meaningful conclusions are obtained which can provide a reference for the practical engineering design of latticed shell structures.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399

【参考文献】

中国期刊全文数据库前8条

1 路维;孙建恒;孙超;赵淑丽;;K8型单层球面网壳非线性动力稳定分析[J];河北农业大学学报;2009年02期

2 王多智;支旭东;范峰;沈世钊;;冲击荷载下K8单层球面网壳的破坏类型[J];工程力学;2008年S2期

3 杜文风;;强震时单层K8型网壳结构非线性动力稳定分析[J];河南大学学报(自然科学版);2008年06期

4 张建胜;武岳;沈世钊;;Kiewitt型单层球面网壳结构风振响应分析[J];建筑结构;2006年02期

5 郭海山,沈世钊;单层网壳结构动力稳定性分析方法[J];建筑结构学报;2003年03期

6 曹正罡,范峰,沈世钊;K 6型单层球面网壳的弹塑性稳定[J];空间结构;2005年03期

7 赵淑丽;孙建恒;孙超;;点支承两向叉筒单层网壳结构非线性动力稳定分析[J];空间结构;2007年02期

8 郭小农,陈扬骥;短程线型单层球面网壳抗震分析[J];空间结构;1999年02期

中国硕士学位论文全文数据库前1条

1 雷拓;强震作用下单层球面网壳的动力性能[D];西安建筑科技大学;2006年