五河口大桥的地震反应分析

五河口大桥是宿淮高速公路上的1座特大型桥梁。本文进行地震作用下双塔双索面预应力混凝土斜拉桥反应谱分析,了解全桥的内力分布情况,根据桥梁的设计情况和有限元结果评价五河口大桥的抗震性能。结果表明,主桥结构关键部位基本保持弹性,满足抗震设计要求;并针对桥梁在地震作用下产生的位移,提出减小震害的措施,供设计人员参考。

Seismic Analysis of the Wuhekou Cable-stayed Bridge

Wuhekou Bridge,which is a large bridge built on the Suhuai highway,is designed as a prestressed concrete cable-stayed bridge with two towers and two cable planes.The dynamic characteristics are analyzed and the seismic response spectrum analysis is done according to the current Code.Force distribution is so clear that the evaluation of antiseismic ability of the bridge can be done according to the results of finite element method and design conditions.Important members still keep in elastic state,and they can satisfy the requirements provided in the Code.Some details,which may be useful to the engineers,are provided according to the displacements under the earthquake to reduce the damage.