泉州晋江大桥引桥隔震设计

Seismic Isolation Design of Approach Spans of Jinjiang River Bridge in Quanzhou

泉州晋江大桥引桥40 m连续箱梁,具有“混凝土梁较重、结构较刚、联长较大、各墩刚度变化较大”的结构特点。为解决高地震烈度区域混凝土桥梁抗震设计难题,采用减隔震设计方案,利用铅芯橡胶隔震支座改善结构动力特性,从而大大降低了结构地震响应,在整体上提高了结构的安全性及抗震性能,并具有较好的经济效益。

The 40-m span continuous box girder used for the approach spans of Jinjiang River Bridge in Quanzhou is characterized by fairly heavy concrete girder, great structure rigidity, long continuous unit and considerable rigidity variations of the girder piers. To find out good solutions to the seismic design problem of the concrete approach spans in the high intensity seismic zone, the design alternative of seismic mitigation and isolation is adopted and lead core rubber bearings are used to improve the dynamic performance of the structure, the seismic response of the structure is therefore greatly reduced, the safety and seismic performance of the structure are globally raised, and rather good economic benefits have been achieved as well.