SYSTEM IDENTIFICATION OF A NUCLEAR REACTOR BUILDINGUNDER FIXED-BASE CONDITION USING MEASURED DATA

摘要

We apply our proposed system identification method to estimate the dynamic characteristics of apartly embedded nuclear reactor building under an imaginary fixed base condition and discuss theresults. Although the proposed method is essentially designed for systems without embedment, theapplicability of the method to partly embedded buildings has already been checked and confirmed inour previous paper, using an analytical model. In this paper, we study the dynamic characteristics of thebuilding itself using forced vibration tests, microtremors and earthquake observation data. Effectsresulting from out-of-plane deformation of the base mat, the sharing ratio of the exciter force betweenthe sealed and inner walls, and the amount of frame averaging needed for reliable spectral analysis arealso studied.