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高层建筑的弹塑性抗震分析方法主要有反应谱法、静力弹塑性分析法和时程分析法,时程分析法比前两者有更强的适用性。以某竖向不规则超限高层建筑结构为例,采用ANSYS软件建立精细化的三维分析模型,进行动力弹塑性时程分析,研究整体结构在强震作用下的动力响应和关键构件损伤发展情况。分析结果表明,罕遇地震作用下,结构的最大层间位移角在规范限值内,核心筒体属结构薄弱部位,连体层上下部位的楼层成为塑性集中的区域。钢管混凝土柱、连体层楼板及裙房屋面的大跨桁架结构在大震作用下表现为弹性。总体来说,结构具有好的抗震性能,满足规范“大震不倒”的要求。
Elastoplastic seismic analysis of high-rise buildings mainly include response spectrum method, static elasto-plastic analysis method and time-history analysis method, and time-history analysis method has stronger applicability than the former two methods. Take an example of a tall vertical irregular tall building structure, using ANSYS software to establish a refined three-dimensional analysis model, dynamic elasto-plastic time-history analysis of the overall structure of the dynamic response of the strong earthquake and the damage of key components . The results show that under the action of rare earthquakes, the maximum inter-story drift angle of the structure is within the standard limits, and the core cylinder is a weak part of the structure. The upper and lower floors of the conjoined layer become plastic concentrated areas. The large-span truss structures of CFST columns, Siamese floors, and podium roofs show resilience under earthquake conditions. Overall, the structure has good seismic performance, to meet the norms “earthquake does not fall ” requirements.