Abstract
This paper describes dynamic test results of high damping rubber bearings and discusses analytical models for the hysteretic restoring force. The dynamic tests were carried out for two types of rubber bearing which had a difference in hardness of rubber. The two types, the rubber bearing of 588kN rated load (the low hardness type) and that of 784kN (the high hardness type), had the same shape, and comprised of 23 rubber sheets of 6mm thickness and 450mm diameter bonded to steel plates. Each type of the rubber bearing was designed to provide the rated mass (60000kg or 80000kg) with a horizontal natural frequency of about 0.5Hz and an equivalent damping ratio of about 15%. For each type of the rubber bearings, the test results revealed various properties of the horizontal and vertical stiffnesses and equivalent damping ratios obtained from the hysteretic restoring force loops. Three analytical models were proposed to express the horizontal hysteretic restoring force, and appropriateness of each model was evaluated.
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