液状化地盤における杭剛性が免震構造物の応答と杭応力に及ぼす影響

摘要

To investigate effects of pile rigidity on response of a base-isolated structure and pile stresses during soil liquefaction, dynamic centrifuge tests were performed on a superstructure-footing model supported by 2x2 piles. Additionally, the shear deformation of the seismic isolator was investigated by analysis of SDOF systems. The following conclusions were reached: (1) The shear force at the pile heads and their tips of the low rigidity piles was smaller than that of the high rigidity piles. (2) The shear deformation of the seismic isolator supported by the low rigidity piles was larger than that supported by the high rigidity piles.%動的遠心載荷実験を行い、杭剛性が液状化地盤における免震構造rn物の杭応力に及ぼす影響を検討した。さらに、実験で計測された基礎rn部加速度を用いて、免震構造物を模擬した1質点系の時刻歴応答解析rnを行い、杭剛性と免震周期が免震層変位に及ぼす影響を検討した。得rnられた知見を以下に示す。