Abstract
Recently, mamrtenance and rehabilitation of existing bridges have become important subjects. Therefore, new techniques are required for damage evaluation and judgement of strengthening efficiency. One of the suggested methods for bridge evaluation is to use vibration measurements.
In this paper, the strengthening of the substructure of a truss bridge aging about 65 years was used as a case study. The two columns of each pier were combined in a gravity-type pier. The vibrational behavior of the bridge before and after the strengthening were measured. Moreover, numerical analysis considering the supported conditions of the basement of piers was made to check the measured results. As a result, the change of vibrational behavior of the bridge was recognized.
