地震観測記録に基づく建物－地盤間の相対変位と地震時側面土圧の関係

抄録

Seismic observation on an actual base-isolated hospital building has been conducted with dense sensors setup of acceleration and earth pressure to evaluate lateral seismic earth pressure acting on an embedded foundation during the earthquake. In this paper we analyze characteristic and mechanism of the lateral seismic earth pressure based on observed data on low and medium-level earthquake response. It is clearly shown that the lateral seismic earth pressure acting on the embedded foundation is closely correlated with the relative displacement between soil and foundation. Impedance function of the foundation is also evaluated by transfer function between lateral seismic earth pressure and relative displacement of soil and foundation. The estimated impedance described in this paper may be of help to the engineers to choose suitable characteristics of impedance for their design when considering the interaction effect between the soil and the structure.