Journal
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Volume 47, Issue 10, Pages 1141-1146Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijnonlinmec.2011.09.004
Keywords
Structural parameter identification; Non-linear structures; Unknown input; Extended Kalman estimator; Least-squares estimation; Substructure approach
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In this paper, an algorithm is proposed for the identification of non-linear structural parameters under limited input and output measurements. The algorithm is based on the sequential application of extended Kalman estimator for the non-linear structural parameters and the least-squares estimation for the unmeasured excitation. First, the identification of small size non-linear structural parameters is studied. Then, based on the substructure approach, the algorithm is extended to identify large size non-linear structural parameters. Interconnection effect between adjacent substructures is accounted by considering the interconnection forces at substructural interfaces as 'additional unknown inputs' to the substructures. The general case that measurements at the substructure interfaces are not available is considered. Two numerical examples which identify non-linear hysteretic parameters of a four-story and an eight-story hysteretic shear-beam building subject to unmeasured excitation respectively, demonstrate the efficiency of the proposed algorithm. (C) 2011 Elsevier Ltd. All rights reserved.
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