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

I-No Yu , Shieh-Kung Huang , Kenneth J. Loh , Chin-Hsiung Loh

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.

Key Words

subspace identification; stabilization diagram; dam-reservoir interaction

Address

I-No Yu — Department of Civil Engineering, National Taiwan University, Taipei 10617, Taiwan
Shieh-Kung Huang — Department of Civil Engineering, National Taiwan University, Taipei 10617, Taiwan; National Center for Research on Earthquake Engineering, NARLabs, Taipei, Taiwan
Kenneth J. Loh — Department of Structural Engineering, University of California-San Diego, La Jolla, CA 92093, USA
Chin-Hsiung Loh — Department of Civil Engineering, National Taiwan University, Taipei 10617, Taiwan; Department of Structural Engineering, University of California-San Diego, La Jolla, CA 92093, USA

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