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On-line Access: 2009-11-30

Received: 2009-06-28

Revision Accepted: 2009-09-24

Crosschecked: 2009-10-12

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.1 P.1-8

10.1631/jzus.A0900462


Temporal variation in modal properties of a base-isolated building during an earthquake


Author(s):  Izuru TAKEWAKI, Mitsuru NAKAMURA

Affiliation(s):  Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8540, Japan; more

Corresponding email(s):   takewaki@archi.kyoto-u.ac.jp

Key Words:  System identification, Shear building model, Modal parameters, Batch processing least-squares estimation method, Forgetting coefficient, Auto-regressive model with exogenous input (ARX) model


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Izuru TAKEWAKI, Mitsuru NAKAMURA. Temporal variation in modal properties of a base-isolated building during an earthquake[J]. Journal of Zhejiang University Science A, 2010, 11(1): 1-8.

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doi="10.1631/jzus.A0900462"
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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.

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