機械設備の弾塑性領域地震荷重の特性に関する2質点系振動モデルによる考察

抄録

This study tries to evaluate the elastoplastic dynamic behavior of mechanical components during earthquake in resonance with their supporting structures, focusing on the response reduction due to inelastic energy absorption and the increase of earthquake load cycles. Four simple two-masses-models with two shear springs, those are linear loaddeflection characteristic for the structure and bi-linear type one for the equipment, are excited with 52 strong earthquake motions observed in Japan, and their response spectra are resulted parametrically with relatively small ductility factors ranged from 1.25 to 5.0. As results, it could be concluded that the seismic design demand reduction estimated by the constant-energy-rule can be reasonably achieved for both of resonant and soft frequency region of the equipment, and the numbers of energy-equivalent earthquake load cycles increases in accordance with targeted ductility factor increase, especially in the resonance between equipment and its supporting structure.