折板网壳结构整体稳定分析中最不利初始几何缺陷的探讨  

Discussion on the Worst Geometrical Imperfections of Global Stability in Table-flap Latticed Shell Structure

作　　者：郑晖[1] 

机构地区：[1]大连广播电视大学,116021

出　　处：《特种结构》2015年第6期7-10,共4页Special Structures

摘　　要：网壳结构整体稳定分析中有三种几何缺陷分析方法,但哪种为最不利缺陷分布一直没有定论。本文以南阳玉器超市屋顶网壳结构为工程背景,对该双层折板网壳结构整体稳定性分析中最不利初始几何缺陷进行了研究。首先对完善结构进行模态分析,然后以各阶模态作为初始几何缺陷分布模态,再对结构进行整体稳定性分析,比较分析哪一阶模态最不利,再将该阶最不利模态与静力失稳模态进行对比。分析结果表明,按第9阶模态施加缺陷比按第1阶模态和按静力失稳模态施加缺陷更为不利。There are three kinds of analysis method of the geometrical imperfection on global stability of lat- ticed shell structure, but the problem which is the worst imperfection is still in discussion. Based on the background of table-flap latticed shell roof structure of Nanyang jade supermarket, this paper studied the influence of initial ge- ometrical imperfections on global stability of table-flap latticed shell structure. The mode analysis of the ideal struc- ture was carried out firstly. Each buckling mode of the structure was introduced as initial geometrical imperfection mode, and the global stability analysis of the strutcure was carried out. Each buckling mode was checked on to find out whether it is the worst buckling mode. Then, the worst buckling mode was compared with the static buck- ling mode. The calculated results indicated that the ninth buckling mode is worse than the first buckling mode and the static buckling mode.

关 键 词：初始几何缺陷 折板网壳结构 模态分析 最不利缺陷 

分 类 号：TU399[建筑科学—结构工程]