An Experiment Research on Different Damping Distributions of Isolation Bearings of Lateral-torsional Coupling Isolated System

The purpose of this research is to study the isolation effect of damping distribution of the lead rubber isolation bearings on lateral-torsional coupling isolated system. A series of shaking table tests of the lateral-torsional coupling isolated system under different eccentricity situations are carried out for a 3-storey, 2-span steel frame, with changing the locations of upper loads and the isolation bearings. Torsional displacement time-history curves and torsional acceleration time-history curves are obtained under different eccentricity conditions and different damping distribution. The experiment shows that making the damping center of the isolation layer closed to the stiffness center of the superstructure or increasing damping radius of the isolation layer can further reduce the torsion reaction of the superstructure.