1. INTRODUCTION
Recently many buildings have been constructed near subways or other traffic facilities in inner city
areas of Japan where vibration or structure borne noise reduces the quality of life of the people
living here. To avoid this problem, it is useful to adopt vibration isolation systems using spring units
and visco-elastic dampers. For this purpose, an experimental and analytical study has been done
including the design of a four story building with consideration of its seismic safety.