中文摘要：

中广核大厦项目由南北两栋独立的塔楼组成，均为复杂超限高层建筑，其中北楼自10层到屋顶层为悬挑钢结构，采用大悬臂转换钢桁架结构体系。本项目结构体系新颖，在结构设计及施工过程中存在三大关键技术难题：风荷载及结构风振，悬挑钢结构的安全性以及悬挑钢结构与混凝土主体结构连接节点的传力可靠性。针对该重要、特殊、复杂的结构体系，按设计使用年限50年进行了结构设计，进行了基于性能的抗震设计、结构振动与舒适度分析；对北楼悬挑钢结构的施工过程进行了模拟分析，对悬挑钢结构受力状态进行了全程监控；同时对悬挑钢结构与主塔楼连接节点进行了有限元分析、实测以及风洞测压试验。通过合理的结构选型、精心的设计、充分的理论分析及试验研究，有效地保证了该超限结构的安全性，为同类工程的实施提供了重要借鉴。

英文摘要：

This project is composed of two independent towers：the north tower and the south tower.The north tower has a large span steel truss structure from its 10th story to its 25th story.The novel and complicat-ed structure system brings a lot of challenges to structural design and construction,which includes wind load induced structural vibration,the safety of the cantilever steel structure,and the reliability of the joint that con-nects the steel structure and the concrete structure.In order to solve these problems,analyses and research have been conducted.This paper introduces these studies,including performance based seismic design,vibra-tion analyses,construction process simulation,structural monitoring of the cantilever steel structure,FEA and monitoring of the joint zone,and wind tunnel tests.