某会展中心钢屋盖结构静力弹塑性分析

Static elasto-plastic analysis on the steel roof structure of a convention and exhibition center

基于某会展中心大跨度空间结构工程,采用SAP2000软件对其部分钢屋盖结构进行建模和Pushover分析.研究了采用Pushover分析法对大跨度空间结构进行竖向静力弹塑性分析的适用性,判断了该结构在罕遇地震作用下的塑性铰发展情况,并对结构进行了竖向非线性时程分析以校核Pushover分析结果,根据分析计算结果为工程设计提出了建议.分析结果表明,结构塑性铰分布均发生在外圈桁架腹杆上,屋盖结构自身抗震性能良好,采用Pushover分析法对大跨度空间结构进行抗震性能评估具有较好的适用性和准确性.

Based on an engineering example of a convention and exhibition center, this paper discusses the use of pushover analysis method for large-span spatial structures by a pushover analysis for the steel roof structure in SAP2000. This paper is also focusing on finding a suitable method to carry out the vertical pushover analyses for large-span spatial structures, and judging the development of plastic hinge under the action of rare earthquake. Also the vertical nonlinear time-history analysis is carried out for the structure to examine the results of pushover analyses. According to the analysis results, some recommendations are provided in this paper. The results obtained by these analyses show that, the steel roof structure has a good seismic performance, and the pushover analysis has good applicability and accuracy for long-span spatial structures.