中文摘要：

本文以概率地震需求分析为基础,对天津永定新河特大桥主桥采用无阻尼器和有阻尼器的桥梁结构进行了抗震性能评价及对比。对地震动强度指标（IM）、工程需求参数（EDP）进行了研究,根据结构的地震需求危险性曲线,给出了该两种不同类型的结构在五十年内发生不同程度破坏的概率,从而为地震灾害损失评估提供依据。研究表明无阻尼器情况下,五十年内发生碰撞的超越概率为1.9%,接近极限超越概率;有阻尼器情况下,五十年内发生碰撞的超越概率为0.4%,能很好地满足性能水准要求。

英文摘要：

In this paper,the seismic performance of the Yongdi ng New River Bridge in Tianjin main bridge without dampers and with damper were ev aluated and compared basing on the probabilistic seismic demand analysis.Indica tors of ground motion intensity measures（IM）,engineering demand parameters（IM） were studied.The probability of occurrence of different damage of the two diff erent types of structures without dampers and with damper in the fifty years can be achieved according to the seismic demand hazard curves,which can provide th e basis for earthquake damage assessment.The results show that the exceeding pr obability of occurrence of collision is 1.9% when the structure without damper, which close to the limit of probability;The exceeding probability of occurrence of collision is 0.4% when the structure with damper,which meet the performance standard requirements well.