ANALYSIS FOR SHAKING TABLE TEST WITH SINGLE SPHERICAL SLIDING BEARING CONSIDERING PRESSURE AND VELOCITY DEPENDENCY ON FRICTION COEFFICIENT

Abstract

 A pendulum-type seismic isolation bearing called a Spherical Sliding Bearing (SSB) is the focus of this research. SSB offers some benefits as a seismic isolator, such as self-centering nature and independent period of the mass of the supporting structure. SSB is usually modeled as a bilinear model in nonlinear analyses; however, a frictional coefficient of SSB has a dependency on surface pressure, velocity and temperature. These factors should properly be modeled in the analyses to design SSB. In this study, a series of shaking table tests using a single SSB was simulated using the model that considered the pressure and velocity dependency on the frictional coefficient. As a result, it was found that the proposed model was able to simulate the experimental results with reasonable accuracy by considering the effects of the pressure and velocity dependency on the friction coefficient.