Abstract
In case of a flood, earth and sand at bottoms of bridge piers are sometimes washed out and thus yielding unstableness of the bridge piers. Therefore, constant monitoring of bridge piers is of great importance in keeping the safety operation of trains. The paper proposes a simplified monitoring system which uses an acceleration pick-up and analyzes the sensor output (vibration signal) of the bridge piers generated with a light hammer. Finally, the validity of the method is demonstrated with an experiment.
