T. Kobayashi et al., SYSTEM-IDENTIFICATION OF THE HUALIEN LSST MODEL STRUCTURE, Earthquake engineering & structural dynamics, 26(11), 1997, pp. 1157-1167
This paper discusses system identification of a 1/4-scale nuclear reac
tor containment Soil-Structure Interaction system (SSI system) based o
n forced vibration tests conducted by an exciter, For both NS and EW e
xcitations, response components orthogonal to the exciting directions
were fairly large because of inhomogeneity of the supporting soil, so,
before applying the system identification procedure, the concept of '
Principal Axes (D-1, D-2)' was introduced for the SSI system. The test
s results were then transposed to the principal axis directions so tha
t the orthogonal components disappeared.(1) The system identification
procedure was applied to these principal axis directions. As a result,
fundamental frequency, damping factor and mode shape with fixed-base
condition were obtained. A mathematical model was thus established by
adjusting the calculated fundamental frequency and mode shape with fix
ed-base condition to these derived from the test results, The mathemat
ical model will be used in the correlation analysis of both forced vib
ration tests and earthquake observation records, (C) 1997 John Wiley &
Sons, Ltd.