珠江新城J2-5地块框架-核心筒超高层结构的罕遇地震弹塑性时程分析

Elasto-Plastic Time-History Analysis for a Frame-Tube Tall Building in Zhu Jiang Xin Cheng J2-5 Plot under Expected Rare Earthquakes

针对具有带加强层、核心筒采用矩形钢管混凝土端柱+钢骨暗支撑+混凝土剪力墙、连梁内埋设钢骨、外框采用圆钢管混凝土柱等特性的广州珠江新城J2-5地块框架-核心筒超高层结构,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,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,以研究该类结构体系的抗震性能。结果表明,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,计算的实例工程采用的框架核心筒形式具有较高的抗震承载力和延性。

The Building in Zhu Jiang Xin Cheng J2 -5 Plot in Guangzhou is a frame-tube tall building with strengthened stories,including concrete-filled steel square tube edge column ＋steel embeded brace in the core tube shearwall,enhancing lintel by steel-concrete composite beam,and using concrete-filled steel tube column in outer frame. Without simplification, nonlinearities of the beam, column and shear wall element were modeled in stress-strain relation level. The explicit method was implemented to integrate the dynamic equations. ABAQUS and Bepta were used to perform the eIasto-plastic time-history analysis under the rare earthquake actions. The seismic performance of this kind of structure was studied. The results show that the structure has sufficient seismic capacity and ductility, the goal of collapse prevention under expected rare earthquake is achieved, the proposed analysis is reliable and promising.