(华东建筑设计研究院有限公司  上海 200002)
［提要］  介绍了国家图书馆二期工程结构设计过程，主要包括结构体系和抗侧力体系确定、结构计算分析、结构超限对策、抗震设计及巨型钢桁架结构的材料选择与节点构造等内容。多道抗震设防的概念以及重要构件基于性能设计的理念在结构设计中得以贯彻。巨型钢桁架采用“地面拼装，整体提升”的施工安装方案，其整体提升的总重量达10 388t，目前居世界第一。
［关键词］  巨型钢桁架  大跨度结构  节点构造  整体提升
Structural Design of Steel Megatruss in National Library PhaseⅡ/Rui Mingzhuo, Liu Mingguo, Wang Dasui, Sheng Feng (East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002,China)
Abstract:The process of structural design for National Library PhaseⅡ is introduced including the structural system establishment, structural analysis, seismic design, material selection and joint connection of long span great steel truss etc. Multiaspect seismic fortification concept and performancebased design of important structural element are carried out. Assembled on the ground and whole structure hoisting is applied on the installation of great steel truss. The total weight of whole structure hoisting is 10 388t which is the largest in the world.
Keywords:great steel truss; long span construction; joint connection; whole structure hoisting