某连体高层结构弹塑性时程分析

Nonlinear time-history analysis of a connected high-rise structure

项目由相距15.6m的2个高99m的主塔楼及高位连接体组成,采用框架-核心筒结构体系。根据结构特征、构件部位及重要程度,针对不同设防水准的地震作用,制定了抗震性能目标。利用有限元软件PERFORM-3D对其进行7度罕遇地震下的弹塑性时程分析,分析中使用非线性纤维模型来模拟剪力墙弹塑性性能。给出结构变形及层间剪力、层倾覆力矩等整体计算结果,并对结构主要抗侧力构件进行性能校核。分析结果表明,罕遇地震作用下,结构的最大层间位移角满足1/100的限值要求;结构构件损坏顺序和分布较为合理,能在一定程度上耗散地震能量;构件塑性发展满足预定的抗震性能目标,结构整体受力性能良好。

The high-rise building is composed of two 99m high towers which are linked by a 15.6m span connection.RC frame-core wall structure is adopted for the structure.Depending on structural features and importance of occupancy, seismic performance objectives were reasonably selected corresponding to the seismic levels.The nonlinear time-history analysis was carried out under the rare earthquake of 7 degree using PERFORM-3D,which offers a nonlinear fiber model to simulate the nonlinear behavior of RC walls.The deformation performance and development of story shear force and story moment were given.The performance of main components was also evaluated.The results indicate that the maximum story drift ratio is less than 1 /100 under rare earthquakes; the order and distribution of damage in the components are reasonable,which can dissipate some dynamic energy; the nonlinear development of the components can fulfill the performance target under rare earthquake.