Trial Design of Cylindrical Spring for Vertical Seismic Isolation Supporting Vertical Reaction Force of 15 MN

Abstract

This paper proposes a cylindrical spring consisting of an inner cylindrical shell, an intermediate cylindrical shell and an outer cylindrical shell as a vertical seismic isolation spring. The inner and outer cylindrical shells are made of steel and are slidably fitted at both ends to form a cylindrical variable volume space. The intermediate cylindrical shell is mainly made of rubber and is stored without any gaps in the cylindrical variable volume space. The basic configuration of the cylindrical spring, the axial strain characteristic equation of the cylindrical spring, a compression volume test of a rubber material, a trial design of a vertical reaction force 15 MN type cylindrical spring, and a compression test of a vertical reaction force 150 kN type prototype are described. The reaction force-deflection curve of the prototype based on the axial strain characteristic equation corresponded well with the reaction force-deflection hysteresis curve obtained in the compression test.