某复杂超高层结构罕遇地震弹塑性时程分析

Elastic-plastic time-history analysis of a super high-rise building under rare earthquakes

某办公楼平面两端为竖向交通和辅助用房的剪力墙筒体,中间为四榀单跨框架。针对该超高层建筑的特殊性,设计中采用了较新颖的结构布置方法。运用ABAQUS+BEPTA程序,将梁、柱和剪力墙的弹塑性在材料的应力-应变层次上精确模拟,同时考虑结构的几何非线性,采用显式积分的方法,对该结构进行了罕遇地震作用下的弹塑性时程分析,以检验其结构布置的合理性和结构的抗震性能。结果表明,调整后的结构形式具有较高的抗震承载力和延性,基于塑性区模型的弹塑性时程分析是保证结构大震不倒的比较有效和可靠的方法。

Two shear wall cores are arrayed on both end of the building layout and four single-span frames are placed in the middle for an super high-rise building.An original structure arrangement was used.Without simplification,nonlinearities of the beam,column and shear wall element were modelled in stress-strain relation level.The explicit method was implemented to integrate the dynamic equations.ABAQUS and BEPTA were used to perform the elastic-plastic time-history analysis under the rare earthquake load.The validity of the structure arrangement and the seismic performance of the structure were studied.The results show that the structure has sufficient seismic capacity and ductility.The goal of collapse prevention under expected rare earthquake is achieved,and the proposed analysis is reliable and promising.