SHAKING TABLE TEST FOR BRIDGE MODEL ISOLATED WITH SINGLE SPHERICAL SLIDING BEARING TO INVESTIGATE THE INFLUENCE TO SUBSTRUCTURE

Abstract

 Although a laminated rubber bearing has been widely used in many bridges as a seismic isolation bearing in Japan, some laminated rubber bearings were damaged during the major earthquakes in recent years. Therefore, it is important to develop a different type of bearings from the laminated rubber bearings in order not to rely on one type of bearings. Spherical sliding bearings (SSB) have been applied for seismic isolation since the 1990’s in some seismic regions. In this study, to investigate the seismic behavior of a single spherical sliding bearing, a series of shaking table tests for bridge model with single SSBs was carried out for applying the SSB to the bridges in Japan. Especially, the influence of the single SSBs to the substructure was investigated.