Estimation method of bridge vibration using a pseudo-response analysis

Low-frequency noise complaints occur to residences near the highway bridge. In order to control the low-frequency vibration of the bridge, it is necessary to grasp the vibration behavior. "Truck-bridge interaction dynamic analysis" is used as a method for estimating traffic vibrations of bridges. In this method, the bridge surface profile data is set and the dynamic responses when the truck travels on the bridge surface is estimated by dynamic analysis of the truck model and the bridge model. However, this method requires exclusive software, detailed modeling of trucks and road surface profile data. In this research, a relatively simple analysis method called "pseudo-response analysis" is proposed. In this method, the measured truck vibration is set as external force acting on the bridge. So the vibration of the bridge that resonates due to the truck vibration can be approximated. Hence, this analysis method can roughly simulate the effect of the external force in the frequency band that causes complaints. Further, general-purpose software can be used for the analysis program. Modeling case and applicability of the "pseudo-response analysis" method are described in this study.