摘要
介绍了某相贯单层组合加肋拱支网壳结构在竖向荷载及风荷载作用下的整体稳定性。采用有限元软件MIDAS,在两种荷载工况下分别进行了此网壳结构的特征值屈曲、几何非线性屈曲分析,初始缺陷对网壳结构的整体稳定性影响分析。结果表明:网壳结构对初始缺陷较为敏感,初始缺陷会明显降低结构稳定性;不同的荷载工况下,失稳的情况亦不同且网壳结构稳定临界系数随着荷载的增大而降低。
The global stability of a single-layer arch-supported intersection shell structure has been studied under vertical and wind load respectively.The analysis of its eigenvalue and geometric nonlinear buckling,influence of initial imperfection and structural stability under the two load combinations was done by finite software MIDAS.The analysis results show that the reticulated shell structures was sensitive to initial geometrical imperfections which would drop global stability remarkably;the instable states would change with different load conditions,meanwhile,stability critical coefficient of reticulated shell would reduce with load increasing.
出处
《钢结构》
2012年第1期1-4,共4页
Steel Construction
关键词
几何非线性
几何初始缺陷
整体稳定性
geometric nonlinearity
initial geometrical imperfection
global stability.
