[提要]  结合武汉市国际贸易中心大厦弹塑性地震反应分析，介绍了一种在现阶段实用又便于应用的多（高）层结构在罕遇地震作用下的弹塑性时程分析方法。通过引入子结构的概念，采用单串或多串集中质量模型，分析了结构在罕遇地震作用下的动力反应，获得了相应的时程与反应包络图，从而对结构的抗震性能作出评价，对抗震设计提出建议。
[关键词]  弹塑性 地震反应 子结构 罕遇地震

By introducing the analysis of Wuhan ITC edifice, a practical elasto-plastic time-history analysis method of a multi-story structure under severe earthquake excitations was presented. Using substructure concept, a multi-story structure could be regarded as one or divided into several substructures, which are connected by flexible or rigid floor. To each substructure, a multi-story concentrated mass model is adopted. Using program NTAMS, including TAMS&NSAMS, we could easily obtain the structural responses such as envelops of story shear force, story drift etc. and time histories of any appointed positions. Therefore, evaluation of seismic performance for a structure under severe earthquake could be camed out. Analytical results can show the effectiveness of NTAMS for structural design.
Keywords: elasto-plastic; time-history analysis; substructures; severe earthquake excitation