空间钢网格盒式筒中筒结构地震弹塑性响应分析

为研究空间钢网格盒式筒中筒结构在地震作用下的弹塑性性能,利用有限元软件MIDAS建立结构数值模型,对其进行罕遇地震作用下弹性时程分析和弹塑性时程分析,并对结构顶点位移时程曲线、基底剪力时程曲线、楼层位移角等进行比较分析.通过结构弹塑性反应分析得到结构塑性铰损伤过程,得出该结构塑性铰发展及构件屈服顺序.结果表明:盒式筒中筒结构抗震防线明确,能够很好地实现基于性能的结构设计.

Elastic-Plastic Seismic Responses Analysis of Steel Space Grid Box Tube-in-Tube Structures

In order to study the elastic and plastic properties of space steel grid cassette tube-in-tube structures under the earthquake actions, numerical model was built by MIDAS software, elastic time-history analysis and elastic-plastic time-history analysis of the structures under rare earthquake actions were performed. Comparative analysis of the time history curve of the top displacement of structure, the time history curve of the base shear force and the floor displacement angle was carried out. Plastics hinge damage process of the structure and the structure plastic hinge development and the yield order of members were obtained by the elastic-plastic reaction analysis. The results show: seismic resistant lines of the box tube-in-tube structure is clear, which conforms to the theory of performance-based seismic design method.