Abstract
In order to ensure sufficient bridge seismic performance, various types of elastomeric isolation bearings have been adopted to the seimic isolation bridges. Even if energy absorption capability of the seismic isolation bearings is taken into account, excessive displacement of bridge girders is inevitable. It causes high constraction cost and maintenance problems . The main objective of this study is the use of the tuned mass dampers (TMD) installed to bridge girders supported by elastomeric isolation bearings to circumvent this problem.The second objective is to calculate the tuning condition of the TMD in order to take nonlinealiry of elastomeric isolation bearings into account. Effectiveness of the TMD installation is discussed based on numerical simulation of the dynamic response, and it is shown that the girder response can be reduced to less than 50% of the original case if the mass ratio of 0.1 is allowed.
