北京电视中心主楼巨型框架-支撑钢结构静力弹塑性地震反应分析

Elastic-plastic Earthquake Analysis of Steel Structure of Main Tower of Beijing TV Center

北京电视中心为超高层乙类建筑,采用了巨型框架-支撑钢结构体系。介绍了在方案设计阶段对结构体系的调整与优化。利用通用有限元程序MIDAS/Gen对结构在罕遇地震作用下的性态进行了静力弹塑性分析(Pushover分析),介绍了分析模型、分析方法和分析结果。分析结果表明,结构在小震及设防烈度地震作用下基本处于弹性状态,在罕遇地震作用下主结构能够保持较好的工作状态。

The main tower of Beijing TV Center is a category Ⅱ structure which is beyond the Chinese structure codes. It＇s a mega-steel-structure composed of mega-frames and braces. The optimization of the structure system is analysed. In order to achieve the performance of the structure under rare earthquake, static elastic-plastic analysis （Pushover Analysis） is carried out with general FEA software MIDAS/Gen. The model, method and the result of this analysis are presented. The result states that the structure is elastic under frequent earthquake and intermediate earthquake and the main structure has good performance under rare earthquake.