建筑结构学报2018，Vol.39Issue(5)：1-9,9.DOI:10.14006/j.jzjgxb.2018.05.001
多层中心支撑钢框架结构抗震性能简化评估方法
A simplified method for seismic performance evaluation of MDOF steel concentrically braced frames
摘要
Abstract
Steel concentrically braced frame (CBF) is a typical kind of dual system. It is difficult to evaluate the seismic performance of CBFs because of the complex feature of restoring force of CBFs which contains a substantial decrease in strength and stiffness after brace failure subjected to strong earthquake loads. To solve this problem,the concept and assessment procedure of reserve capacity parameters of multi-degree of freedom (MDOF) CBFs were presented. Pushover analysis was performed to transform the MDOF structure to the SDOF system and the structural failure mode was identified. The reserve capacity parameters representing strength and stiffness ratios between reserve system and primary system were also established. A simplified procedure for estimating the collapse performance, ductility and displacement response of MDOF CBFs with reserve capacity was constructed combining with the ductility demand spectra. This method is called 'reserve capacity method'. A reasonable accuracy was demonstrated by comparing the results of ductility demands and roof displacements of proposed method with the results obtained by nonlinear dynamic analyses of two 5-story test buildings. The results show that the reserve capacity method is capable of predicting seismic performance of MDOF CBFs.关键词
中心支撑钢框架结构/等效单自由度体系/储备体系/抗震性能/抗倒塌能力/能力储备Key words
concentrically braced frame/equivalent SDOF system/reserve system/seismic performance/collapse prevention/reserve capacity分类
建筑与水利引用本文复制引用
董志骞,李钢,李宏男..多层中心支撑钢框架结构抗震性能简化评估方法[J].建筑结构学报,2018,39(5):1-9,9.基金项目
国家自然科学基金优秀青年科学基金项目(51422802),中央高校基本科研业务费专项(DUT17ZD220). （51422802）
