摘要
利用大型通用有限元软件ANSYS对一个40 m跨度的单层K8网壳进行了分析。分析包括静力稳定分析和动力稳定分析。静力稳定分析方面有线弹性屈曲分析、几何非线性稳定分析以及双非线性稳定分析。计算了不同的缺陷下网壳的极限荷载因子,分析了网壳的缺陷敏感性,探讨了采用理想弹塑性模型模拟钢材Q235的合理性。动力稳定分析方面有模态分析和瞬态动力分析。针对网壳是否考虑静荷载作用分别进行模态分析,考察了静力荷载产生的应力和变形对结构的自振频率的影响。采用taft波,并分别用比例调幅为0.3 g和0.4 g,再对网壳进行瞬态动力分析,比较其动力响应,得出了对工程结构设计有用的结论。
The large universal finite element software ANSYS was used to analyze a 40 meters single span reticulated shell K8. The analysis includes static stability analysis and dynamic stability analysis. Static stability analysis includes linear elastic buckling analysis,geometric nonlinear stability analysis and bi-nonlinear stability analysis. The ultimate load factor of reticulated shells which has different defects was calculated,and the sensitivity of defects was analyzed. The reasonableness of using ideal elastoplastic model to simulate steel Q235 was discussed.Dynamic stability analysis includes modal analysis and transient dynamic analysis. The modal analysis of reticulated shell was done and the effects of static load,which generate stress and deformation,on the natural frequencies of reticulated shell were investigated. The taft wave was used and scaled its amplitude to 0. 3 g or 0. 4 g,transient dynamic analysis of reticulated shell was done. The dynamic response was compared and useful conclusions for the design of engineering structure were made.
出处
《科学技术与工程》
北大核心
2016年第16期249-253,270,共6页
Science Technology and Engineering
基金
国家自然科学基金(51478330)项目资助
关键词
几何非线性
双非线性
极限荷载因子
理想弹塑性
自振频率
瞬态动力分析
geometric nonlinearity
bi-nonlinearity
ultimate load factor
the ideal elastoplastic
natural frequency
transient dynamic analysis
