Seismic Response of Transamerica Building. II: System Identification
Publication: Journal of Structural Engineering
Volume 117, Issue 8
Abstract
A detailed analysis of the recorded seismic response of the Transamerica Building during the October 17, 1989 Loma Prieta earthquake is presented. The system identification algorithm used for the analysis is based on the discrete‐time linear filtering approach with least‐squares approximation, and assumes a multi‐input, single‐output model for the building. Fifteen modes in the north‐south direction, and 18 modes in the east‐west direction are identified from the records. The analysis shows that the building's response to the earthquake was dominated by a coupled mode of vibration at 0.28 Hz in the southwest‐northeast direction, which is almost parallel to one of the diagonals in the building's square cross section. The reason for this behavior is the symmetry of the building's structural characteristics, as well as the strong polarization of the S‐waves of the earthquake. Several higher modes of the building were excited during the strong‐motion part of the earthquake. The results also show a significant amount of rocking in the building at a frequency of 2.15 Hz.
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References
1.
Çelebi, M., and Şafak, E. (1991). “Seismic response of Transamerica Building. I: Data and preliminary analysis.” J. Struct. Engrg., ASCE, 117(8), 2389–2404.
2.
Şafak, E. (1988). “Analysis of recordings in structural engineering: Adaptive filtering, prediction, and control.” Open‐File Report, 88–647, U.S. Geological Survey, Menlo Park, Calif.
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Şafak, E., and Çelebi, M. (1990). “New techniques in record analysis: Torsional vibrations.” Proc., 4th U.S. Conf. Earthquake Engrg., Earthquake Engineering Research Institute, Palm Springs, Calif.
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Copyright © 1991 ASCE.
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Published online: Aug 1, 1991
Published in print: Aug 1991
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