RESUMO
The Higashi-Ohgishima viaduct of Metropolitan Expressway. Bay-shore Route (4th phase), is a 9-span continuous prestressed concrete box-girder bridge using base isolator. In order to improve seismic resistance, a reaction distribution method using rubber bearing supports was adopted for the bridge. In addition, seismic design using menshin technology was carried out so that the piers, bearing supports and main girders would withstand an earthquake of the magnitude of the Great Earthquake of 1923. For the bearing, the LRB bearing having energy dissipating capability was adopted, and its dynamic characteristics were verified by approving test for dynamic load and elasto-plastic dynamic analysis. Vibration test were also perfomed on the bridge itself during construction to confirm the propriety of the design.(AU)
