摘要
本文以一个50m跨度的单层穹顶网壳为例进行了荷载-位移全过程分析。研究了该结构作为理想壳的非线性稳定性能,以及加荷过程中若干次屈曲后的结构位移形态。单层穹顶网壳对初始缺陷极为敏感,而实际结构不可避免存在初始安装偏差;但国内外对有缺陷网壳的稳定问题研究很少。本文在这方面做了探索,提出两种缺陷分析方法,并论证了这些方法用于实际工程的可行性。
Taking a single-layer lattice dome of 50 meter span for example,the whole process of load-deflection response is analyzed in this paper.The nonlinear beha- viors of a perfect dome and its deflection shapes at several points after buckling are in- vestigated.Single-layer lattice dome is very sensitive to initial imperfections which are unavoidable in real structures;but little work has been done on stability analysis of imperfect lattice shell both at home and abroad.In this paper,two methods for imperfection analysis are suggested,and the possibility of their applying to engi- neering practice are demonstrated as well.
基金
建设部科技发展基金
关键词
网壳
荷载
位移
几何非线性
位移
lattice shell
geometric nonlinearity
imperfection
