Seismic Response Analysis of a Floating Seismic Isolation Building Model

Abstract

Floating seismic isolation building has been proposed as a measure to reduce seismic response of small modular reactor (SMR). Demonstration experiment on floating seismic isolation building was conducted in February 2024. Seismic response analysis model for OpenFOAM was built by reference to the demonstration experiment. The analytical model consists of a pool, water, and a floating structure on the water. To confirm the availability of the analytical model, the time history analysis was conducted using a sine wave with an amplitude of 0.05 m in the vertical direction and horizontal direction, respectively. As a result, the maximum response displacement in horizontal direction by the horizontal input was reduced by 53.8 % compared to the input wave, but the maximum response displacement in the vertical direction by the vertical input was amplified by 515 % compared to the input wave, due to the noticeable drift in the vertical response displacement. The result indicated that the current analytical model has a problem in reproducing behavior in the vertical direction, and we will continue to improve the analytical model.