In recent years, the seismic observation records near the earthquake fault were obtained by development of the seismic observation networks. These seismic observation records show that the earthquake motion near the earthquake fault may far exceed the earthquake motion that is taken into consideration on the conventional design. Relative displacement may be set to 1 m or more to such an earthquake motion. It is necessary to design in consideration of the collision between a superstructure and a retaining wall. In order to use for the retaining wall collision analysis of the base-isolated buildings, design case questionnaire was carried out.
