摘要：研究目的：以10组典型特征周期的铁路减隔震桥梁为研究对象，采用支座位置处延性位移作为地震响应参数(EDP)，研究近断层地震作用下减隔震铁路桥梁地震响应参数与多种地震动强度指标IM的相关性。 研究结论： (1)速度型IM指标最为适用于表征近断层减隔震桥梁非线性位移需求；（2)当结构初始特征周期与地震波高频能量集中区域频率及速度脉冲周期相近时，将导致EDP对IM值变化敏感，减隔震桥梁结构设计时应注意避开 结构周期敏感区域；（3）本研究成果可为近断层铁路桥梁的减隔震设计提供技术支撑。

Abstract：Research purposes： Selecting ten groups of isolated railway bridges with typical period as the research object and the ductile displacement of the isolation as the engineering demand parameter (EDP), the correlation between seismic responses of isolated railway bridge subjected to near-fault ground motion and intensity measure index(IM) of ground motion has been evaluated.  Research conclusions： (1) The velocity type of IM index is most suitable for characterization of near-fault isolated bridge nonlinear displacement demand. (2) When the initial period of structure is similar to frequency area contains the most of the high-frequency energy of seismic wave or the velocity pulse period will lead to EDP is insensitive to the change of IM value, when design an isolated bridge, the initial period should avoid the sensitive frequency area. (3)This research result can provide guidelines to seismic design for the railway bridges located on near-fault zone.