The conventional seismic design of buildings with the pile foundation often uses the fix foundation model. However, in actual buildings with the pile foundation, sway and rocking occur in the span direction, which have a significant influence on the seismic performance. The purpose of this study is to investigate the effect of the vertical displacement of the piles on the response of superstructures. The paper showed that the base shear of the superstructures given by the soil-pile-structure

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... eraction model was remarkably small compared with the fix foundation model, and that the tendency of a top heavy shape of the shear coefficient distribution along the height was significantly alleviated if the vertical displacement of the piles was taking into account.