(同济大学土木工程学院，上海 200092）

［摘要］武进金融大厦是一幢上部结构高差悬殊、下部大面积地下室不设缝的复杂高层建筑，设计采用桩筏基础，桩基为预应力高强混凝土PHC管桩，纯地下室部分PHC管桩兼作抗拔桩。为减小上部高差悬殊引起的不均匀沉降，结构设计时采用了变刚度调平设计方法。计算表明，该方法能有效调整桩筏基础的不均匀沉降。通过对连廊节点采用GPZ盆式橡胶隔震支座，弱化主塔楼与裙房的连接，使上部结构单元变得简单规则。结构计算表明，结构振型、层间位移角、承载力均满足规范要求。裙房大跨度屋盖采用了后张有粘接预应力混凝土井字梁楼盖结构，设计时考虑了次弯矩的影响。

［关键词］桩筏基础；变刚度调平； PHC管桩；隔震支座；预应力井字梁

Structural design of Wujin finance mansion

Li Yonghua, Li Siming

(School of Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract:Wujin finance mansion is a sophisticated high-rise building without joint in large area basement. Prestressed high intensity concrete (PHC)pipe piles are used in pileraft foundation design, and the PHC piles are also used to be against floatation in single basement. An optimal pile-raft design is proposed to reduce differential settlement based on foundation rigidity adjustment, and the calculation results show that it can reduce the differential settlement effectively. By using GPZ isolation bearings to weaken the connection of steel gallery, the units of structure become more regular. The analysis results of the structure show that the deformation, story displace ratio, modal and bearing capacity satisfy the demand. The post tensioned bonded prestressed square-crossing beams are applied in larger span roof design of podium, and secondary moments are considered in design.

Keywords:pile-raft foundations; PHC piles; isolation bearing; prestressed square-crossing beam