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System identification of the Hualien LSST model structure

✍ Scribed by Kobayashi, Toshio; Kan, Satoshi; Yamaya, Hiroyoshi; Kitamura, Eiji

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
275 KB
Volume
26
Category
Article
ISSN
0098-8847

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✦ Synopsis

This paper discusses system identification of a -scale nuclear reactor containment Soil-Structure Interaction system (SSI system) based on forced vibration tests conducted by an exciter. For both NS and EW excitations, 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 , D )' was introduced for the SSI system. The tests results were then transposed to the principal axis directions so that the orthogonal components disappeared. 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 fixed-base condition to these derived from the test results. The mathematical model will be used in the correlation analysis of both forced vibration tests and earthquake observation records.

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