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本研究で対象とした高速道路に架設されたPC桁橋は大型車両の走行に伴い車両と橋梁との連成振動が生じ大きく振動していた本研究では試験車走行実験および路面計測によりその振動原因を路面凹凸の周期性であると判断したそこで様々な走行速度重量およびばね特性を有した一般の大型車走行によって生じた車両と橋梁との連成振動により橋梁が受ける影響として主桁の応力度がどの程度動的に増幅しているのか2年間の長期モニタリングから明らかにしたさらにその路面を補修したことによりその応力度がどの程度低減できたのか路面補修後の試験車走行実験と1年間の一般車走行を対象としたモニタリングにより明らかにした   Object prestressed concrete bridge with a 37.47m span vibrated greatly due to the resonation of the leaf suspension spring vibration arose from road roughness with the spatial wavelength near the expansion joint, only when the test truck ran in the 2nd slow lane. The bridge dynamic response affects the driver's riding comfort and the load-carrying capacity of the bridge. The monitoring was carried out for two years and five months in order to grasp the dynamic stress of the girders and the total weight of the trucks ordinarily running on the bridge. Moreover, the road roughness with a long spatial wavelength was repaired. After the repair, the same monitoring is continuing currently in order to compare with the data gathered about the dynamic response of the bridge before the repair. This paper describes the results of the dynamic response of the bridge resonated to the trucks' spring vibration arose from road roughness with a long spatial wavelength by monitoring before and after the repair

DYNAMIC RESPONSE OF BRIDGE AFFECTED BY ROAD ROUGHNESS WITH A LONG SPATIAL WAVELENGTH IN MONITORING BEFORE AND AFTER REPAIR