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Report No.
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Experiment of floating seismic isolation system

Mori, Takashi*; Shimada, Takahiro*; Kai, Satoru*; Otani, Akihito*; Yamamoto, Tomohiko  ; Yan, X. 

Experiment of a floating seismic isolation technology for application to small modular reactor (SMR) is conducted on a small-scale apparatus. The SMR is assumed to be located on land rather than offshore, and installed on a newly proposed floating structure in a pool. The floating structure is designed acts to mitigate the propagation of the horizontal component of seismic motion between the ground and the SMR buildings, and to reduce the excitation force on the buildings caused by the vertical wave propagation through water of vertical seismic motion. The floating structure was designed to have a gaseous space called Air Cavity and orifice at the bottom of the structure. Experiment is conducted to verify the effect of the floating structure on reduction to vertical seismic motions. The results demonstrate the effectiveness of the Air Cavity and orifice to reduce response during vertical earthquake motion, and those method is more reduce response than Compared to using only Air Cavity. Thus these method were founds an isolating effect against vertical seismic motion, and it is considered that result in this study will help SMR.

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