23 March 2015 Output-only identification of civil structures using nonlinear finite element model updating
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Abstract
This paper presents a novel approach for output-only nonlinear system identification of structures using data recorded during earthquake events. In this approach, state-of-the-art nonlinear structural FE modeling and analysis techniques are combined with Bayesian Inference method to estimate (i) time-invariant parameters governing the nonlinear hysteretic material constitutive models used in the FE model of the structure, and (ii) the time history of the earthquake ground motion. To validate the performance of the proposed framework, the simulated responses of a bridge pier to an earthquake ground motion is polluted with artificial output measurement noise and used to jointly estimate the unknown material parameters and the time history of the earthquake ground motion. This proof-of-concept example illustrates the successful performance of the proposed approach even in the presence of high measurement noise.
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Hamed Ebrahimian, Rodrigo Astroza, Joel P. Conte, "Output-only identification of civil structures using nonlinear finite element model updating", Proc. SPIE 9438, Health Monitoring of Structural and Biological Systems 2015, 943819 (23 March 2015); doi: 10.1117/12.2084573; https://doi.org/10.1117/12.2084573
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