Abstract
In this study, the authors attempted to extract the vibration characteristics of a railway bridge from the axle acceleration response of a running train, in order to provide fundamental information for movable monitoring. Firstly, a passing train test was conducted using actual trains and bridges, to extract predominant frequency, which can be observed only when a train passes a bridge, from the frequency characteristics of axle acceleration, and their repeatability and speed dependency were checked. Then, the extracted frequency and the natural frequency of the bridge were compared to identify the predominant mode and clarify the effects of train speed and direction, etc. on natural frequency. In addition, using the acceleration response measured at a bridge, the variation in the components of the predominant mode of the bridge was analyzed. As a result, it was found that the natural frequency of the bridge around 82Hz contributes to the development of the predominant frequency of the train axle.
