Abstract
Since the serious corrosions on countermeasures for aerodynamic stability were found on the Tozaki viaduct, which was completed approximately 20 years ago, it is necessary to make the repair plan. In order to reduce the future maintenance cost, the reevaluation on aerodynamic stability of this bridge was conducted. As a result, it was clarified that the half of the original countermeasures have little effect on the aerodynamic stability of this bridge and those members were removed. Furthermore, it was also confirmed that there was no particular change of the dynamic characteristics of the girder before and after the removal of the half of the countermeasure.
