Development of an Improved Deformation History Integral Type Hysteresis Model for High-Damping Rubber Bearings

Deformation history integral type hysteresis (DHI) model is a numerical model for seismic isolation bearing which has high non-linearity in restoring force characteristics, such as high-damping rubber bearing (HDR). While the model can represent the complex behavior of HDR including performance change by temperature, aging and manufacturing variation, the scragging effect, which is generally considered in practical design of seismic isolation system, is not taken into account in the conventional model. In this study, the model was improved by defining scragging effect as a function of performance change ratio. In order to confirm the accuracy of the proposed model, time history analysis was carried out and the results of analysis were compared with those of substructure real-time online testing (SROLT) using scaled model of HDR. The analysis results showed good agreement with those of SROLT and the applicability of improved DHI model was verified.