512 弾塑性応答スペクトルに基づく機器の弾塑性特性に関する考察

概要

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Elasto-plastic deformation decreases maximum seismic response compared with elastic deformation due to hysteresis damping. In this study, we discussed elasto-plastic behavior of components by calculating resonant curve and elasto-plastic response spectrum obtained from single-degree-of-freedom system. As a result, we demonstrated that the allowance of plastic deformation significantly reduced yield strength demand of components with response amplification. For example, if ductility ratio of 2 is allowed at elasto-plastic system with stiffness ratio of 0.2, yield strength demand tends to decrease to the strength corresponding to Zero Point Acceleration (ZPA) on building floor multiplied by mass. Elasto-plastic response spectrum is less sensitive to the natural frequency compared with elastic response spectrum. And the evaluation using elasto-plastic response spectrum might be useful even if dead load is applied to elasto-plastic system. Moreover, we discussed seismic evaluation method using elasto-plastic response spectrum and suggested that the evaluation method using static load determined from elasto-plastic response spectrum.
一般社団法人日本機械学会の論文
2011-09-05