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Abstract: Temporal variation of dynamical modal properties of a base-isolated building is investigated using earthquake records in the building. A batch processing least-squares estimation method is applied to segment-wise time-series data. To construct an input-output system, an auto-regressive model with exogenous input (ARX) of second-order including a forgetting coefficient as a weighting coefficient is used for the estimation of modal parameters. The fundamental and second natural frequencies and the damping ratios of the fundamental and second natural modes of the base-isolated building are identified in the time domain. The identified results are consistent with the results obtained from the micro-tremor vibration data, forced-vibration test data and earthquake records in the present base-isolated building in the case of taking into account the amplitude-dependency of the isolators and viscous dampers. It is finally pointed out that several factors, e.g., amplitude dependency of the isolator and damper system and special characteristics of the series-type viscous damper system, may be related complicatedly with the temporal variation in modal properties of the above-mentioned system.

[1] Agbabian, M.S., Masri, S.F., Miller, R.K., Caughey, T.K., 1991. System identification approach to detection of structural changes. Journal of Engineering Mechanics, ASCE, 117(2):370-390.

[2] Beck, J.L., Jennings, P.C., 1980. Structural identification using linear models and earthquake records. Earthquake Engineering & Structural Dynamics, 8(2):145-160.

[3] Davenport, A.G., Hill-Carroll, P., 1986. Damping in Tall Buildings: Its Variability and Treatment in Design. Proceedings of ASCE Spring Convention, Seattle, USA, p.42-57.

[4] Doebling, S.W., Farrar, C.R., Prime, M.B., Shevitz, D.W., 1996. Damage Identification and Health Monitoring of Structural and Mechanical Systems from Changes in Their Vibration Characteristics: A Literature Review. Report No. LA-13070-MS, Los Alamos National Laboratory, NM, USA.

[5] Ghanem, R., Shinozuka, M., 1995. Structural-system identification I: Theory. Journal of Engineering Mechanics, ASCE, 121(2):255-264.

[6] Hart, G.C., Vasudevan, R., 1975. Earthquake design of buildings: Damping. Journal of the Structural Division, ASCE, 101(ST1):11-30.

[7] Hart, G.C., Yao, J.T.P., 1977. System identification in structural dynamics. Journal of the Engineering Mechanics Division, ASCE, 103(EM6):1089-1104.

[8] Herrmann, T., Pradlwarter, H.J., 1998. Two-step identification approach for damped finite element models. Journal of Engineering Mechanics, ASCE, 124(6):639-647.

[9] Hjelmstad, K.D., 1996. On the uniqueness of modal parameter estimation. Journal of Sound and Vibration, 192(2):581-598.

[10] Hjelmstad, K.D., Banan, M.R., Banan, M.R., 1995. On building finite element models of structures from modal response. Earthquake Engineering & Structural Dynamics, 24(1):53-67.

[11] Hoshiya, M., Saito, E., 1984. Structural identification by extended Kalman filter. Journal of Engineering Mechanics, ASCE, 110(12):1757-1770.

[12] Housner, G., 1997. Special issue, structural control: past, present, and future. Journal of Engineering Mechanics, ASCE, 123(9):897-971.

[13] Inaudi, J.A., Kelly, J.M., 1995. Linear hysteretic damping and the Hilbert transform. Journal of Engineering Mechanics, ASCE, 121(5):626-632.

[14] Kareem, A., Gurley, K., 1996. Damping in structures: Its evaluation and treatment of uncertainty. Journal of Wind Engineering and Industrial Aerodynamics, 59(2-3):131-157.

[15] Kitada, Y., 1998. Identification of nonlinear structural dynamic systems using wavelets. Journal of Engineering Mechanics, ASCE, 124(10):1059-1066.

[16] Koh, C.G., See, L.M., Balendra, T., 1991. Estimation of structural parameters in time domain: a substructure approach. Earthquake Engineering & Structural Dynamics, 20(8):787-801.

[17] Lus, H., Betti, R., Longman, R.W., 1999. Identification of linear structural systems using earthquake-induced vibration data. Earthquake Engineering & Structural Dynamics, 28(11):1449-1467.

[18] Masri, S.F., Nakamura, M., Chassiakos, A.G., Caughey, T.K., 1996. A neural network approach to the detection of changes in structural parameters. Journal of Engineering Mechanics, ASCE, 122(4):350-360.

[19] Mendel, J.M., 1995. Lessons in Estimation Theory for Signal Processing, Communications, and Control (2nd Ed.). Prentice Hall, New Jersey.

[20] Nakamura, M., Takewaki, I., 2002. System Identification Method for Interstory Stiffness and Damping through Limited Observation: Application to Ambient Vibration and Robustness for Noise. Summaries of Annual Meeting of AIJ, Structure II, p.291-292 (in Japanese).

[21] Nakamura, M., Takewaki, I., 2005. Evaluation of Time-variance of Dynamic Properties of a Base-isolated Building during an Earthquake. Summaries of Annual Meeting of AIJ, Structure II, p.675-676 (in Japanese).

[22] Nakamura, M., Takewaki, I., Yasui, Y., Uetani, K., 1998. System Identification Method for Interstory Stiffness and Damping through Limited Observation: Application to Ambient Vibration and Robustness for Noise. Summaries of Annual Meeting of AIJ, Structure II, p.291-292 (in Japanese).

[23] Nashif, A.D., Jones, D.I.G., Henderson, J.P., 1985. Vibration Damping. John Wiley & Sons, New York.

[24] Safak, E., 1989. Adaptive modeling, identification, and control of dynamic structural systems I: Theory. Journal of Engineering Mechanics, ASCE, 115(11):2386-2405.

[25] Satake, N., Suda, K., Arakawa, T., Sasaki, A, Tamura, Y., 2003. Damping evaluation using full-scale data of buildings in Japan. Journal of Structural Engineering, ASCE, 129(4):470-477.

[26] Shinozuka, M., Ghanem, R., 1995. Structural-system identification II: Experimental verification. Journal of Engineering Mechanics, ASCE, 121(2):265-273.

[27] Stewart, J.P., Conte, J.P., Aiken, I.D., 1999. Observed behavior of seismically isolated buildings. Journal of Structural Engineering, ASCE, 125(9):955-964.

[28] Takewaki, I., Nakamura, M., 2000. Stiffness-damping simultaneous identification using limited earthquake records. Earthquake Engineering and Structural Dynamics, 29(8):1219-1238.

[29] Takewaki, I., Nakamura, M., 2005. Stiffness-damping simultaneous identification under limited observation. Journal of Engineering Mechanics, ASCE, 131(10):1027-1035.

[30] Yao, J.T.P., Natke, H.G., 1994. Damage detection and reliability evaluation of existing structures. Structural Safety, 15(1-2):3-16.

[31] Yoshitomi, S., Takewaki, I., 2009. Noise-effect compensation method for physical-parameter system identification under stationary random input. Structural Control and Health Monitoring, 16(3):350-373.