Session: SE-02-01 Seismic Isolation and Structural Dynamics-1

Paper Number: 121899

121899 - Research and Development of Three-Dimensional Isolation System for Sodium Cooled Fast Reactor: Part 9 Evaluating Seismic Isolation Performance Through Seismic Response Analysis 

This paper elucidates the isolation performance of a newly developed three-dimensional seismic isolation system through seismic response analysis. A novel three-dimensional isolation system was developed and assessed through static loading tests, aiming to unveil the hysteresis loops for each element, labeled Part 1 to Part 6.

To ascertain the design feasibility of the isolation system, static loading tests were judiciously conducted, considering a wide array of loading conditions, including the beyond-design basis ground motion. Employing the accumulated test data, a new analytical model was devised, capable of precisely capturing the hysteresis loops for each element. Evaluating the seismic isolation performance based on the static loading results of the entire system posed a notable challenge. Nevertheless, the hysteresis characteristics of the overall system in both horizontal and vertical directions were elucidated using a static loading test with a half-scale model, as detailed in Part 7 and Part 8.

The authors conducted a seismic response analysis with using the new analytical models, simulating the static loading test results of the half-scale model. This paper demonstrates that our isolation system exhibits superior isolation performance against both the design basis and beyond-design basis ground motions when compared to a horizontal isolation system consisting of rubber bearings and oil dampers.

Presenting Author: Tsuyoshi Fukasawa Tokyo Denki University

Presenting Author Biography: Since joining Mitsubishi Heavy Industries in 2010, Fukasawa has been dedicated to the research and development of seismic design for next-generation nuclear reactors. He was honored with the Outstanding Paper award at ASME PVP in 2019. Currently, Fukasawa has been serving at Tokyo Denki University since 2021

Authors:

Tsuyoshi Fukasawa Tokyo Denki University
Takahiro Somaki Obayashi Corporation
Masaki Yukawa Obayashi Corporation
Tomoyuki Hirayama Mitsubishi FBR Systems
Tomoyoshi Watakabe Japan Atomic Energy Agency
Tomohiko Yamamoto Japan Atomic Energy Agency
Shigeki Okamura Japan Atomic Energy Agency
Masashi Miyazaki Japan Atomic Energy Agency
Masato Uchita Japan Atomic Power Company
Takayuki Miyagawa Japan Atomic Energy Agency
Satoshi Fujita Tokyo Denki University