103 Research and Development of Floor Isolation System Using Vertically Utilized Elasto-Plastic Coiled Springs

Abstract

This paper describes the research and development of a new seismic isolation system using vertically utilized elastic and elasto-plastic coiled springs, and discusses analytical model for coiled spring. The horizontal static tests were performed to evaluate the restoring characteristic and the mechanical model of elastic and elasto-plastic coiled springs. The characteristics of these coiled springs such as transverse stiffness and hysteretic damping and the validity of the analytical model were clarified through the static tests. Furthermore the response analyses based on the restoring force characteristics of experimental results were carried out to assess the isolation performance of this system.