阻尼器对高速铁路连续梁桥易损性的影响研究

摘要

The medium span prestressed concrete continuous beam is widely used in high speed railway.In the past,the earthquake damage and the experiments showed that the damage of the bridge under the earthquake was concentrated on the pier and the support.In order to study the effect of damper on seismic vulnerability of high speed railway continuous beam bridge,in this paper,a typical high speed railway continuous girder bridge was taken as an example,adopting IDA method,the seismic vulnerability analysis model was established by using the finite element software OpenSees.Four kinds of failure limit states were defined,and the seismic vulnerability curves were obtained using probability based on reliability theory resolving vulnerability function expression,the influence of damper on seismic vulnerability of bridge was discussed.The results showed that setting damper was more reasonable for the bridge and could improve the seismic performance of the bridge.%中等跨径的预应混凝土连续梁广泛运用于高速铁路,以往震害及实验都表明该类桥型在地震下的破坏集中在桥墩和支座位置.为研究阻尼器对高速铁路连续梁桥地震易损性的影响,以某典型高速铁路连续梁桥为例,采用IDA方法,利用有限元软件OpenSees建立了地震易损性分析模型,定义四种破坏极限状态,并应用基于可靠度理论的概率解析易损性函数表达式获得地震易损性曲线,探讨阻尼器对桥梁地震易损性的影响.结果表明:设置阻尼器使桥梁受力更为合理,可进一步提高桥梁抗震性能.