Modal Identification of Structures from Seismic Response Data via Amplitude-Dependent Time Series Model

Wei Chih Su; Chiung Shiann Huang; Ching Yu Liu

doi:10.4028/www.scientific.net/AMM.479-480.1155

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Development of Physical-Parameter Identification Procedure for Energy-Dissipated Buildings with Symmetric Ductile Braces
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 479-480Modal Identification of Structures from Seismic...

Modal Identification of Structures from Seismic Response Data via Amplitude-Dependent Time Series Model

Abstract:

The present work develops a novel procedure of establishing a amplitude-dependent time series model for a nonlinear system and estimating the instantaneous modal parameters of the system from the dynamical responses. The undetermined coefficient in a amplitude-dependent autoregressive with exogenous input (amplitude-dependent ARX) model are assumed as function s of amplitude and are expanded by shape functions constructing by moving least-squares with polynomial basis functions. The amplitude of dynamical responses could be obtained by Hilbert transform. The instantaneous modal parameters of the system are directly estimated from the coefficient in the amplitude-dependent ARX model. Finally, the proposed approach is applied to process measured data for a frame specimen subjected to a series of base excitations in shaking table tests. The specimen was damaged during testing. The identified modal parameters are consistent with observed physical phenomena.

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Periodical:

Applied Mechanics and Materials (Volumes 479-480)

Pages:

1155-1159

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.479-480.1155

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Online since:

December 2013

Authors:

Wei Chih Su*, Chiung Shiann Huang, Ching Yu Liu

Keywords:

Amplitude-Dependent ARX, Instantaneous Modal Parameters, Moving Least-Squares

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