【摘要】 网壳结构的动力稳定分析是空间结构研究的重要课题之一,目前在网壳结构动力稳定分析中大多没有考虑杆件缺陷对结构动力稳定性能的影响。本研究在考虑节点初始几何缺陷的基础上,采用多段梁法形成初始弯曲来模拟杆件初始缺陷,并以K8型单层球面网壳为例系统分析了在三向地震作用下考虑杆件缺陷的单层球面网壳结构动力稳定特性,以及杆件缺陷对网壳结构整体稳定性的影响。结果表明:考虑杆件缺陷的网壳会较大降低结构的稳定承载力,其中单元的精细划分影响显著。更多还原

【Abstract】 Dynamic stability analysis is a very important research project in the space structures.Up to now,in most researches,the imperfections of members are not included in the dynamic stability analysis for the single-layer reticulated shell structures.In this paper,based on the theory of initial geometrical imperfection,using multiple-beam method to simulate the initial bending deformation of the members,the dynamic stability behavior of a K8 single-layer reticulated shell structure under three dimensional earthquake actions is analyzed by considering the member imperfections.The effect of member imperfections to the dynamic stability behavior of the structure is investigated.The results show that the reticulated shell considering member imperfection will largely reduce the stability bearing capacity of the structure,the unit of fine division effect is remarkable.更多还原