326 ゴム球を用いた軽量構造物免震支承の性能実験(建築構造物の制御III)(OS 建築構造物の制御)

概要

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Various shaking table tests of Rubber Ball Bearings(RBB) for base isolation system are curried out. The first tests are curried out for the first system with RBB with 4 rubber balls of diameter 60mm and the steel weight of 2400N in order to investigate the dependency on displacement amplitude from 5mm to 30mm and input frequencies from 0.5Hz to 3.0Hz. The obtained restoring force-deformation relation is approximated by Rumberg-Osgood hysteresis(R-O model) for any displacement and frequency. The next tests are curried out for the full scaled structure having the weight of about 50.0 KN and RBB with 84 rubber balls for the sweep sine waves from 0.3Hz to 1.0Hz under the condition that the displacement of shaking table holds 70mm. The relation is approximated by perfect elasto-plastie bilinear hysteresis. In order to investigate the differences between both experiments, the static loading test for large displacement of 250mm is performed. The obtained hysteresis can be expressed as bilinear hysteresis. The results can be considered that the hysteresis loops changes from R-O model to bilinear hysteresis when the rubber balls rolls over 1time of rotation.
社団法人日本機械学会の論文
2001-04-20