基于大震动力弹塑性分析的某超高层混合结构抗震设计

Seismic design of a super high-rise hybrid structure based on dynamic elastoplastic analysis under rare earthquake

某超高层办公楼采用钢框架-钢筋混凝土核心筒混合结构体系。通过对结构进行罕遇地震作用下的动力弹塑性时程分析,按照"初步计算→确定措施→最后验证"三个步骤,找出结构的薄弱部位,考察关键构件如钢框架、核心筒等在大震下的损伤情况,进而针对性地选择了加强措施。对损伤严重的关键构件通过等效弹性计算方法进行性能设计,并采用弹塑性分析方法对所采取的设计措施进行验证,确保结构实现预定的抗震性能目标。

A super high-rise office building adopts steel frame-reinforced concrete corewall hybrid structural system. Through the dynamic elastoplastic time-history analysis of the structure under rare earthquake, three steps of "preliminary calculation → determination of measures → final verification" were followed, the weak parts of the structure were found out, and the damage of key components such as steel frame and corewall under rare earthquake was investigated, and then the corresponding strengthening measures were selected. The equivalent elastic calculation method was used for the performance design of the key components with serious damage, and the elastoplastic analysis method was used to verify the adopted design measures, so as to ensure the structure to achieve the predetermined seismic performance targets.