考虑初始几何缺陷的弦支穹顶结构动力稳定性分析
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摘要
根据基于B-R运动准则改进的判别方法,采用ANSYS有限元分析软件,考虑材料弹塑性,应用静力稳定分析中的"一致缺陷模态法"考虑结构初始缺陷,对不同矢跨比的弦支穹顶结构动力稳定性能进行了研究。研究表明,初始缺陷对结构动力稳定临界荷载有影响,并且初始缺陷对不同矢跨比的结构影响不同。因此,在进行结构分析时,初始缺陷影响不可忽略。
Based on B-R criteria,a modified practical method for judging the dynamic stability of suspen-domes with imperfection was used in this paper.Using the consistent imperfect buckling analysis method adopted in the analysis of static stability,the effect of initial geometrical imperfection on the dynamic stability was analyzed by means of finite element analysis software ANSYS.The results show that the dynamic instability critical load of the imperfection structure is different from that of a perfection structure.The influence of imperfections is different between larger rise-span ratio and smaller rise-span ratio.To imperfection structures or perfection structures,rise-span ratio affects the dynamic stability.Thus initial imperfection influence cannot be ignored when doing structural analyzing.
Based on B-R criteria,a modified practical method for judging the dynamic stability of suspen-domes with imperfection was used in this paper.Using the consistent imperfect buckling analysis method adopted in the analysis of static stability,the effect of initial geometrical imperfection on the dynamic stability was analyzed by means of finite element analysis software ANSYS.The results show that the dynamic instability critical load of the imperfection structure is different from that of a perfection structure.The influence of imperfections is different between larger rise-span ratio and smaller rise-span ratio.To imperfection structures or perfection structures,rise-span ratio affects the dynamic stability.Thus initial imperfection influence cannot be ignored when doing structural analyzing.
引文
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[2]郭海山,沈士钊.单层网壳结构动力稳定性分析[J].建筑结构学报,2003,24(3):1-9.
[3]李忠学.初始几何缺陷对网壳结构的静、动力稳定性承载力的影响[J].土木工程学报,2002,35(1):11-24.
[4]陈昕,沈士钊.单层穹顶网壳的荷载-位移全过程及缺陷分析[J].哈尔滨建筑工程学院学报,1990,23(4).
[5]张爱林.初始几何缺陷对弦支弯顶结构整体稳定影响的施工偏差概率法[J].钢结构,2006,增刊:202-209.
[6]叶继红.单层网壳结构的动力稳定分析[D].上海:同济大学,1995.
[7]罗永峰,刘慧娟,韩庆华.弦支穹顶结构动力稳定性分析方法研究[J].西南交通大学学报,2008,43(6):729-735.
[8]史杰.弦支穹顶结构力学性能分析和实物静动力试验研究[D].天津:天津大学,2004.
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