Abstract：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.
2017, Vol. 34 
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