摘要
单层球面网壳冗余度较低,个别杆件失效容易引起结构连续倒塌。为提高单层球面网壳的抗连续倒塌能力,可以采用将单层网壳主肋设计为局部双层的方法。应用ABAQUS软件通过自编程序,考虑杆件失稳及失稳后行为,对比分析了采用局部双层前、后静力荷载作用下单层球面网壳极限承载力、节点位移和失效模态,以及采用局部双层前、后地震荷载作用下单层球面网壳极限承载力。分析了地震作用下局部双层厚度不同时单层球面网壳结构的极限承载力。分析结果表明,将单层球面网壳主肋设计为局部双层可提高网壳结构极限承载力,改变网壳失效模式。
Since single-layer reticulated shell has low level of redundancy,progressive collapse may occur when single member fails.To prevent progressive collapse from happening,partial double-layer reticulated shell is adopted to improve the collapse-resisting capacity.In this paper,static analysis was carried out to analyze single-layer reticulated shell using ABAQUS,and the results of ultimate bearing capacity,node displacement and failure mode were compared to the results of partial double-layer shell.Also,dynamic analysis was conducted to compare the ultimate bearing capacity between single-layer and partial double-layer shells under strong earthquakes.The analysis results indicate that the method of designing partial double-layer shell can enhance the ultimate bearing capacity of the structure,and it can also change the failure mode of single-layer reticulated shells.
出处
《建筑钢结构进展》
北大核心
2013年第6期20-24,57,共6页
Progress in Steel Building Structures
关键词
单层球面网壳
连续倒塌
局部双层
失效模态
极限承载力
single-layer reticulated shell
progressive collapse
partial double-layer
failure mode
ultimate bearing capacity
