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http://dx.doi.org/10.12989/smm.2019.6.4.347

Application of subspace identification on the recorded seismic response data of Pacoima Dam  

Yu, I-No (Department of Civil Engineering, National Taiwan University)
Huang, Shieh-Kung (Department of Civil Engineering, National Taiwan University)
Loh, Kenneth J. (Department of Structural Engineering, University of California-San Diego)
Loh, Chin-Hsiung (Department of Civil Engineering, National Taiwan University)
Publication Information
Structural Monitoring and Maintenance / v.6, no.4, 2019 , pp. 347-364 More about this Journal
Abstract
Two seismic response data from the CSMIP strong motion instrumentation of Pacoima dam are selected: San Fernando earthquake (Jan 13, 2001; ML=4.3) and Newhall earthquake (Sept. 1, 2011; ML=4.2), for the identification of the dam system. To consider the spatially nonuniform input ground motion along the dam abutment, the subspace identification technique with multiple-input and multiple-output is used to extract the dynamic behavior of the dam-reservoir interaction system. It is observed that the dam-reservoir interaction is significant from the identification of San Fernando earthquake data. The influence of added mass (from the reservoir) during strong ground motion will create a tuned-mass damper phenomenon on the dam body. The fundamental frequency of the dam will be tuned to two different frequencies but with the same mode shapes. As for the small earthquake event, the dam-reservoir interaction is insignificant.
Keywords
subspace identification; stabilization diagram; dam-reservoir interaction;
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