Effects of Lead Plug in Lead Rubber Bearings on Seismic Responses for anIsolated Test Structure

摘要

The effects of lead rubber bearings are investigated by shaking table tests and seismic response analyses for 1/8-rnscale isolated test structure. A simple analysis model representing the actual dynamic behaviors of the test structure isrndeveloped, and the seismic analyses of the simple model are performed for lead rubber bearings with three differentrndiameters of lead plug. The diameter of the lead plug had to be enlarged to increase isolator damping more than 24 %rnand this causes the isolator stiffness to increase, which results in amplifying the acceleration response of the isolatedrntest structure in the higher frequency ranges with the monotonic reduction of isolator shear displacement.