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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (1): 1-8    DOI: 10.1631/jzus.A0900462
Civil Engineering     
Temporal variation in modal properties of a base-isolated building during an earthquake
Izuru TAKEWAKI, Mitsuru NAKAMURA
Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8540, Japan; Technical Research Institute, Obayashi Corporation, Tokyo 204-8558, Japan
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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.

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     
Received: 28 June 2009      Published: 30 November 2009
CLC:  P315  
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Izuru TAKEWAKI
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Izuru TAKEWAKI, Mitsuru NAKAMURA. Temporal variation in modal properties of a base-isolated building during an earthquake. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(1): 1-8.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0900462     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I1/1

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