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In this study the performance of concrete bridge has been under dynamic load near-fault earthquake in the area. According to available data showing the effects of the key uncertainties in earthquake ground motions near field fault, the performance of the bridge near the earthquake fault is investigated Two openings for three-dimensional modeling of a bridge taken in the application CSI Bridge And for evaluating the ability of a structure under earthquake near an earthquake fault area away from the fault, was assessed. Time history analysis based on models created under 7 record of past earthquakes on both far and near to a fault, was Through examining the record of near-fault earthquakes was observed that these earthquakes to produce a strong Tghyyrmkanhay far-fault earthquakes. Bridges isolated using seismic isolators, compared to far-fault earthquakes are a very good response this means By removing the bridges, the acceleration acting on the decks, cutting the base as well as the relative displacement uncut deck of the bridge reduced This is in response to the bridges near-fault earthquakes there. By examining the record of the earthquake was near an earthquake fault than the fault displacement away from strong earthquakes produce Which can enhance separation system in crisis situations, it is necessary to prevent this event The double system (FDGM) to modify call bridges that are used by the earthquake Change location near a fault code and the effect of taking away from the fault area will be more progressive So that for different ratios of distance to fault, whatever the value of this ratio is less, shift more and the maximum cutting force up to the bridge piers will be.

Keywords: Dynamic response, Ground motions, Near fault, Far fault

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