强震下网壳动力分析及破坏模式研究

发布时间：2018-07-08 16:46

本文选题：强震作用 + 矢跨比　；参考：《兰州理工大学》2011年硕士论文

【摘要】：近些年来,空间结构的发展相当迅猛。并且很多空间建筑已成为艺术作品被人们所津津乐道。网壳结构是一种颇具魅力的空间网格结构,因其造型美观、受力合理、能覆盖较大的空间,被广泛应用于体育场馆、车站、会展中心以及其它重要的公共建筑中,结构重要性等级通常较高,一旦发生破坏对人民的生命财产造成严重危害。关于空间结构在静力方面的研究时至今日已经取得了很大的成就,其基本理论已经相当成熟。但其在动力特别是像在地震作用下的力学性能还处于发展和完善阶段。因此研究大跨度空间结构在强震作用下的响应具有重大的现实意义。在强震等动力荷载作用下,网壳可能出现塑性发展较浅,结构刚度几乎没有削弱,结构位移较小的动力失稳破坏。也可能出现结构塑性发展较深,刚度严重削弱的强度破坏,也可能出现动力失稳破坏与结构强度破坏的综合作用。本文结合最近的参考文献,在前人的工作基础之上,以单层球面K8型网壳及庆阳体育馆为工程背景,利用非线性有限元理论,通过大型有限元软件ANSYS研究了网壳结构在强震作用下的动力性能及破坏模式。主要工作如下: (1).首先对工程中常用矢跨比为1/3、1/5、1/7的单层球面K8型网壳进行了模态分析,总结了随矢跨比变化网壳结构自振特性的变化规律,及其静力恒荷载几何刚度对结构自振特性的影响; (2).在模态分析的基础上,采用基于结构响应的全过程分析方法,利用软件ANSYS,综合宏观、微观响应指标,对单层K8型球面网壳进行动力分析研究;并通过典型算例的分析比较,确定了单层K8型球面网壳的破坏模式及其特征; (3).利用前面对单层K8球面网壳的研究成果,对实际一复杂双层网壳——庆阳体育馆进行了考虑静力恒荷载几何刚度影响下的模态分析,并在模态分析的基础之上对其进行了动力时程分析,探讨这种复杂双层网壳其在强震下的动力特性。
[Abstract]:In recent years, the development of space structure is quite rapid. And many space architecture has become a work of art that people enjoy talking about. The reticulated shell structure is a kind of attractive spatial grid structure, which is widely used in stadiums, stations, exhibition centers and other important public buildings because of its beautiful shape, reasonable force and the ability to cover large space. The level of structural importance is usually high, and damage to people's lives and property is serious. Great achievements have been made in the research of spatial structure in static force, and its basic theory has been quite mature. But its mechanical properties under dynamic, especially seismic action, are still in the development and improvement stage. Therefore, it is of great practical significance to study the response of long span space structures under strong earthquakes. Under the action of strong earthquake and other dynamic loads, the dynamic instability of reticulated shell may occur, such as shallow plastic development, almost no weakening of structural stiffness and small displacement of the structure. It is also possible that the structural plastic development is deep and the stiffness is seriously weakened, and the combined effect of dynamic instability failure and structural strength failure may also occur. In this paper, based on the previous work and the engineering background of single-layer spherical K8 reticulated shell and Qingyang Gymnasium, the nonlinear finite element theory is used. The dynamic behavior and failure mode of latticed shell structures under strong earthquake are studied by ANSYS. The main work is as follows: (1). First of all, the modal analysis of single-layer spherical K8 reticulated shell with a ratio of 1 / 3 / 1 / 5 / 1 / 7 is carried out, and the variation law of the natural vibration characteristics of latticed shell structure with the ratio of vector to span is summarized. The influence of geometric stiffness of static constant load on the natural vibration characteristics of the structure; (2). On the basis of modal analysis, the dynamic analysis of single-layer K8 spherical reticulated shell is carried out by using the whole process analysis method based on structural response, using the software ANSYSand synthesizing macro and micro response indexes, and through the analysis and comparison of typical examples, the dynamic analysis of single-layer K8 spherical reticulated shell is carried out. The failure mode and characteristics of single-layer K _ 8 spherical reticulated shell are determined. (3). Based on the previous research results of single-layer K8 spherical reticulated shell, the modal analysis of a complex double-layer reticulated shell-Qingyang Gymnasium under the influence of geometric stiffness of static constant load is carried out. On the basis of modal analysis, the dynamic time history analysis is carried out, and the dynamic characteristics of this complex double-layer latticed shell under strong earthquake are discussed.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TU399

【参考文献】