A system for recording seismic behavior was installed at a model gravity quay wall (full-scale) at the No. 4 Wharf in the West Area of Kushiro Port, Hokkaido. The system is able to record the seismic behavior of the wall simultaneously with that of the ground behind it, and to record the external forces acting on the wall and ground. The seismic behavior was successfully recorded during an earthquake that rated "5-upper" on the Japanese scale of seismic intensity and that displaced the wall by about 20cm. This paper analyzes the phase relationship between the inertial forces acting when the wall was displaced and the distribution of earth pressure during the earthquake. We propose a more rational and economical method of seismic design for gravity quay walls by focusing on the interaction between the behavior of the wall and the behavior of the ground behind it.
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