Response Characteristics of Spherical Sliding Bearings and Superstructure Subject to Bidirectional Ground Motions

Abstract

Although the performance of seismic isolation devices as rubber bearings or dampers have been tested and evaluated through unidirectional input, actual seismic response working on these devices are bidirectional. Recently the performance of high-damping rubber bearings is found to be different from those under unidirectional input, and bidirectional tests for various isolation devices are being carried out. In this paper, bidirectional shaking table tests for SSB (Spherical Sliding Bearing/ Friction Pendulum Bearing: FPB) are carried out, and the difference of their response against unidirectional response is researched. Found bidirectional effects are discussed using analytical model taking these effects into account, followed by the studies on the effects on the response of supported superstructures.

Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

“…Additionally, the continuous beam bridge with a combination of different bearings has more complicated response to earthquakes because (1) LRBs and HDRBs have nonlinear horizontal stiffness, quite different from NRBs especially at high shear strain amplitudes, and (2) some factors, such as pier height and span length, also influence the seismic performance of the bridges [24][25][26]. Researchers have investigated the failure modes and seismic performance of a continuous beam bridge with a combination of different bearings during strong ground motions [21,27].…”