国家金融信息大厦主楼结构设计

Structural design on main building of National Financial Information Center

国家金融信息大厦主楼为两处连体的双主楼超高层结构,具有高度超限、多塔、连体、刚度突变、承载力突变等多项平面及竖向不规则超限项。介绍了结构体系、连体桁架选型与建筑特点的逻辑关系。采用有限元方法对索幕墙支承结构构件承载力和刚度进行分析。结果表明,利用3层连体桁架及中部连接体去承担索幕墙荷载的方案是可行的。利用顶层室内设备管道空间设置空间三角桁架解决屋面连接体的承载问题;将屋顶空间三角桁架与伸臂桁架相结合,在屋顶设置加强层,解决整体结构抗侧刚度不足的问题。通过对整体模型、高区分塔模型和完全分塔模型的计算结果对比,研究了连接体失效对结构抗震性能的影响,为结构承载力包络设计提供了依据。

The main building of National Financial Information Center is a super high⁃rise structure consisting of two connected double main buildings.It has many plane and vertical irregular exceeding limits,such as height overrun,multi⁃towers,towers linked with connective structure,stiffness mutation,bearing capacity mutation and so on.The logical relationship between structural system,connecting truss selection and architectural characteristics was introduced.The finite element method was used to analyze the bearing capacity and stiffness of the supporting structural components of the cable curtain wall.The analysis results show that the scheme of using a 3⁃story connected truss and a central connecting body to bear the load of the cable curtain wall is feasible.By using the space of equipment pipeline in the roof,space triangular trusses are set up to solve the load⁃bearing problems of roof connectors.Combining the roof space triangular truss with the cantilever truss,a reinforcement layer is set on the roof to solve the problem of insufficient lateral stiffness of the overall structure.By comparing the calculation results of the overall model,high zone split tower model,and fully split tower model,the influence of connector failure on the seismic performance of the structure was studied,providing a basis for the envelope design of structural bearing capacity.