ABSTRACT
A method of filling the lower space of a bridge with rigid polyurethane foam (RPU foam) to reduce the traffic load along with seismic reinforcement is often applied to extend the life of bridges in Japan. The purpose of this study was to evaluate the reinforcement effect and change in the vibration characteristics of a bridge that was converted into a lightweight embankment using RPU foam filling. A truck was driven before and after filling an actual bridge with RPU foam and monitored the embankment behavior. RPU foam was observed to reduce the vibration and strain of the slab at the center of the span. The predominant frequency inside the RPU foam when a traffic load was applied was approximately 5 Hz, and long-period vibration was confirmed compared to the slab.
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