泰康金融中心超高层结构高度为237.3m，为三塔连体结构。各单塔高宽比均超过规范限值，存在较大平面偏心，需将3个单塔在适当楼层相连形成相互支撑的连体结构，因此在第18层、29层、40层设置三处连桥，结构抗侧刚度和抗扭刚度有明显的提升，在竖向荷载作用下，竖向构件受力更加均匀，在水平荷载作用下，水平位移大幅度减小。针对刚度突变、扭转效应、施工影响和节点设计等复杂连体结构的关键问题进行研究，结果表明：连体结构存在较大的刚度突变，连桥上部楼层在罕遇地震作用下容易形成薄弱层，在设计中应适当加强；三塔连体结构的整体性和抗扭刚度较强，扭转效应不明显；施工方案对连体结构的受力模式影响较大，经过比选后采用连桥层以上单塔结构施工先于连桥施工，但是领先楼层数不超过5层的施工方案；对连桥连接关键节点的有限元分析结果表明，节点可满足预设的抗震性能目标要求。

Taikang Financial Center high-rise building is a three-tower connected structure with a height of 237.3m. The slenderness ratio of each single tower exceeds the provision limit considerably and the eccentricity of plans are significant, hence the single tower structure is difficult to establish. Therefore, three connecting bridges are set up on the 18th, 29th and 40th floors to connect the three towers as a whole. The torsional stiffness and lateral stiffness of the connected structure are evidently enhanced. The forces in the vertical components become more average under gravity and the lateral displacements of structure become extensively lower under lateral load. The key issues of complex multi-tower connected structure are studied such as stiffness change, torsional effect, influence of construction sequence and joint design. The results reveal that the multi-tower connected structure has huge stiffness change, resulting in the existence of weak floor upon the top bridge, which needs to be strengthened in design. The torsional effect of the building is not obvious because of the integrality and the high torsional stiffness. The construction sequence has an evident influence on mechanical behavior. The construction scheme of the tower structure above the connecting bridge being constructed before the connecting bridge is adopted, but the number of leading floors does not exceed 5 floors. Finite element analysis of key joints of the bridge is performed, showing that the behavior of joints can meet the seismic performance objective.