中国国家博物馆改扩建工程结构总体设计

General structure design of National Museum of China

中国国家博物馆改扩建工程包括原老馆的抗震加固改造和新建两大部分,其建筑空间形式丰富,内部功能复杂、多样。结合建筑总体功能布局要求以及对老馆的抗震鉴定结论,保留老建筑中西、北段,采取抗震加固改造的方式,保留原有地上3层建筑格局;对南段采取抗震加固并加层改造的方式,地上由3层增至5层,保留老馆按30年设计使用年限进行加固改造。新老建筑功能上统一,结构上完全断开,通过对新馆基础形式以及基坑开挖方式的研究,实现新老建筑的合理衔接。新建部分主体结构采用钢筋混凝土结构,楼层及屋顶大跨部分采用钢桁架结构,形成多筒体-部分框架结构体系。新建部分基础采用桩筏基础并进行了地基基础沉降协调分析。在工程中采用了钢板混凝土组合剪力墙,进行了抗震性能化分析以及大跨钢结构与混凝土结构的连接节点、大跨结构楼盖振动舒适度等分析研究。

The general structure design of National Museum of China consists of two main parts,seismic reinforcement for original structure and construction for new part.The rebuilding project reserves original architectural style of museum in west and north appearances,while two new floors are added on the south part.The seismic reinforcement for old building was based on 30 years working life expectation.To appropriately connect the buildings between old and new part,a specifically designed foundation excavation program is executed to ensure the separated structures perform consistent building function.The new part is built by reinforcement concrete structure,while the steel truss is installed for large-span roof and floors,thereby,two models formed a multi-tube with part of frame structure.Depending on the analysis of foundation settlement coordination,the foundation of new constructed part is built on a piled raft system.Moreover,a series of other engineering technologies are applied in the national museum project such as： steel plate concrete composite wall,performance based seismic resistance analysis,the connecting research for node between large-span steel truss and RC structure,the vibration comfort study of large-span structure.