We performed at a time history response analysis considering the performance fluctuation of the seismic isolation devices for long-period ground motion. In a building model designed against long-period ground motion to correspond only to conventional notice waves, the maximum response displacement of the base isolation layer exceeds the critical strain depending on the long-period area. However, in the model where oil dampers are added to these models, it has been confirmed that the maximum response displacement of the base isolation layer are reduced by the oil damper.
