コイルばねを鉛直設置した免震装置に関する研究 : 第2報,弾塑性コイルばねの準静的加力実験(機械力学,計測,自動制御)

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This paper describes static loading tests results of elasto-plstic coiled springs and discusses analytical model for hysteretic restoring force. The static loading tests were carried out for two types of elasto-plastic coiled spring in which had a different material SS400 and SWRM17 steel. The elasto-plastic coiled springs were designed to provide a 1 000 kg rated mass with a horizontal 1st natural frequency about 0.74 Hz, yield displacement of about 25 mm and an equivalent damping ratio of 30% or more. The tests results revealed various properties of horizontal stiffness and equivalent damping ratios obtained from the hysteretic restoring force loops. The repeated shear deformation tests showed that the coiled springs could keep their integrity thought the 100-cycle repetition tests. An analytical model for elasto-plastic coiled springs was proposed to express the horizontal hysteretic restoring force, and validity of the analytical model was evaluated.
社団法人日本機械学会の論文
2008-03-25