風荷重の動的成分が高減衰系積層ゴムの応答特性に与える影響に関する実験的研究及びその解析モデルの検討

摘要

高減衰積層ゴムにおける風応答特性の評価試験を実施した。一般に復元力と減衰性能を併せ持つ免震装置は、一定荷重を与えた場合にクリープ変形を示す。風応答評価試験の結果、高減衰積層ゴムのクリープ特性は風荷重の静的成分だけでなく、動的成分にも依存することがわかった。即ち、静的成分を一定とし、動的変動成分を様々に変化させた場合のクリープ特性を調べると、動的変動成分が大きい程、積層ゴムの水平変形が大きくなる性質を示すことが明らかとなった。%In this study, wind response properties of high damping laminated rubber bearings (HDR) is investigated by experimental and analytical methods. According to the experimental result of HDR, horizontal creep deformation depends on magnitude of dynamic loading as well as that of static loading under the wind loading. This feature differs from other seismic isolation devices. Then we propose the simplified evaluation method and hysteresis model for time history response analysis under wind loading, which are established by taking account of the effect of creep deformation caused by dynamic loading. Firstly, we perform the wind loading test for high damping laminated rubber bearings and establish the simplified evaluation method and hysteresis model based on the test results. Next, we verify the validity of proposed models by comparing the analysis results with experimental results. Finally, we perform the time history response analysis using proposed hysteresis model.