南昌绿地紫峰大厦结构设计关键技术

Key techniques for structural design of Nanchang Greenland Zifeng Tower

南昌绿地紫峰大厦建筑高268m,采用框架-核心筒结构体系,为超B级高度超限高层建筑结构。在建筑高度2/3位置,东西立面内凹,内凹部分的荷载通过结构柱支承在层41～43这3层高(含暗钢桁架)的7m跨悬臂转换墙上。在核心筒底部加强区设置型钢,底部框架柱采用型钢混凝土柱,转换墙内暗埋钢桁架。整体结构及构件设计融入性能化设计思想,对结构进行了小震下的反应谱计算和动力时程计算以及中震弹性复核,并进行了大震下的弹塑性时程分析。详细阐述了采用ANSYS软件对转换层部位进行的有限元分析,同时介绍了首层挑空部位、竖向变形差、基础设计等关键技术。

Nanchang Greenland Zifeng Tower is a 268-meter-high building beyond B-level height. The structural system is frame-core tube reinforced concrete structure. In the upper portion, the west and east faces of the tower are recessed to form a concave folded surface. The floor framing in these areas is supported by transfer walls at the F41, F42, F43, which are cantilevered from the building core tube. Embedded steel shape is used in the core wall in the bottom strengthened zone and transfer zone. SRC columns are applied in the bottom. The performance-based seismic design principle and method were applied in the structure design. The integral structure under the frequently occurred earthquake was analyzed, the elastic dynamic time-procedure analysis, elastic analysis under medial earthquake and the elasto-plastic analysis under the rare earthquake were also carried out. The study of cantilevered transfer walls was especially illuminated. Sky lobby on the ground floor, vertical deformation difference and the foundation design were also introduced.