丽泽SOHO双塔复杂连体超限高层结构体系研究

位于北京丰台的丽泽SOHO为超高层双塔复杂连体结构，中庭内立面结构盘旋上升，立柱均为弧形，造型复杂。丽泽SOHO每个单塔采用筒体 单侧弧形框架结构体系，2个单塔由4道椭圆形腰桁架及连桥连接组成整体。主结构高度为191.5m，为反对称复杂双塔筒体 框架结构，弧形钢连桥跨度为9～38m。介绍了通过设置立面斜撑、斜柱以及连桥将双塔“箍”成整体的具体方案，并对不同方案进行了对比分析。通过在2个单塔之间设置4道由腰桁架和连桥形成的腰带将2个单塔“箍”在一起，形成一个整体性强、抗震性能良好的结构体系。此外，对2个单塔之间的连接方式和效率分析结果、结构的具体性能指标以及超限审查进行了简要介绍。该项目方案的形成过程及结构体系可为类似复杂工程设计提供参考。

Research on structural system of LEEZA SOHO tall buildingwith complicated connected twin-tower

LEEZA SOHO is a complicated connected twin-tower structure. The plan of a single tower is spiral-up layout on the atrium side. The single tower is an arc-shaped frame-core wall structural system. There are four ellipse rings made of bridges and middle trusses between the two towers. The four rings make the two towers become an entire structure. The structure is composed of two complecated dissymmetry towers, which are connected by steel bridges of 9-38 m long. The structure is 191.5 m high. The three structural concepts are compared. One is a ‘resistance’ concept by the braces on the fa-ade of the single tower. The second concept is ‘dredge’. Some columns are used to support the gravity of the suspended structure directly. The third concept is ‘hoop’. Bridges and waist trusses are set between the two towers like hoops. These hoops will make the two towers become an entire structure. The strucutre will have a good seismic performance. The effects of the connection between the two towers are introduced. The adopted structural system and the calculation results are summarized, which can provide usefule reference to similar seismic design of complicated super tall buildings beyond code limit.