Abstract
A HDR (high damping rubber) damper with long stroke and large damping force is newly developed as a vibration control device for bridges. In this report, fundamental performance test and hybrid loading test of HDR damper are described. In the fundamental test, equivalent stiffness and equivalent damping ratio of HDR damper, and their shear strain dependence were investigated. As a result, equivalent stiffness and equivalent damping ratio are decreasing as the increase of shear strain. Furthermore, the dynamic response of two-type bridges with the proposede device were investigated by conducting hybrid loading test. This result shows the proposed HDR damper has very high performance for earthquake response control of bridges.
