ひし形リンク構造を用いた免震設計に関する研究

概要

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This paper deals with a seismic isolation system having nonlinear characteristics mechanism for a vertical seismic oscillation. The seismic isolation system consists of a rhombus shape link, horizontal coil springs and vertical coil springs. Restoring force of the system can be calculated by the geometric calculation. This paper proposes a design principle of the system, using that the natural period of the seismic isolation system can be calculated from its restoring force characteristics. An experimental model of the seismic isolator having nonlinear characteristics was actually made, and its restoring force characteristics were measured by static loading test. Frequency response function of the seismic isolation device was measured using shaking equipment. From these experimental results, it was revealed that the characteristics of the seismic isolation device can be accurately estimated from the proposed design principle.