中国尊大厦施工图设计中的弹塑性时程分析

Elastic-plastic time-history analysis in the construction drawing design phase of China Zun Tower

北京CBD核心区Z15地块中国尊大厦是一栋地上108层、地下7层、建筑总高度528m、高宽比约7.2的复杂超高层建筑,是目前世界上8度抗震设防烈度区在建的最高建筑。结构设计采用了巨型钢-混凝土筒中筒结构体系。在施工图设计阶段,根据结构体系的最新调整情况对结构进行罕遇地震下的弹塑性时程分析,检验结构在大震下的抗震性能。弹塑性时程分析时采用ABAQUS软件和自主开发的S2A程序将梁、柱、剪力墙、支撑及楼板等构件的弹塑性在应力-应变层次上进行精确模拟,分析过程中考虑几何非线性,并采用显式积分算法。结果表明,结构整体及绝大部分构件的抗震性能满足规范和性能目标的要求。基于塑性区模型的弹塑性时程分析对本工程结构体系的优化起到了重要的作用。

China Zun Tower in Z15 plot of Beijing CBD core area is a 528m（ architectural height） complex super high-rise building with aspect ratio of 7. 2 and 108 layers above ground as well as 7 layers underground. It＇s the tallest building under construction in the area with seismic precautionary intensity of 8 in the world. The mega steel-concrete tube-in-tube structural system is adopted in the structural design. In the construction drawing design phase,according to the latest adjustments of the structural system,the elastic-plastic time-history analysis under rare earthquake was performed on the structure to check the seismic performance of the structure under rare earthquake. In the elastic-plastic time-history analysis,ABAQUS software and autonomously developed S2 A program were used to accurately simulate the elasticity and plasticity of the structural members of beams,columns,shear walls,braces and slabs in stress-strain level. Geometric nonlinearity was considered in analysis process,and the explicit integration computing method was implemented. The result shows that the seismic performances of the whole structure and most of the structural members can meet the requirements of codes and performance goals. The plasticity region based elastic-plastic time-history analysis method plays an important role in the optimization of the structural system of this project.