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

Abstract

 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 2^nd 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.