Vibration-based Bayesian model updating of civil engineering structures applying Gaussian process metamodel

Moravej, Hossein, Chan, Tommy, Nguyen, Khac Duy and Jesus, Andre ORCID: (2019) Vibration-based Bayesian model updating of civil engineering structures applying Gaussian process metamodel. Advances in Structural Engineering, 22 (16). pp. 3487-3502. ISSN 1369-4332

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Structural health monitoring plays a significant role in providing information regarding the performance of structures throughout their life spans. However, information that is directly extracted from monitored data is usually susceptible to uncertainties and not reliable enough to be used for structural investigations. Finite element model updating (FEMU) is an accredited framework that reliably identifies structural behavior. Recently, the modular Bayesian approach (MBA) has emerged as a probabilistic technique in calibrating the finite element model (FEM) of structures and comprehensively addressing uncertainties. However, few studies have investigated its performance on real structures. In this paper, MBA is applied to calibrate the FEM of a lab-scaled concrete box girder bridge. This study is the first to use the MBA to update the initial FEM of a real structure for two states—undamaged and damaged conditions—in which the damaged state represents changes in structural parameters as a result of aging or overloading. The application of the MBA in the two states provides an opportunity to examine the performance of the approach with observed evidence. A discrepancy function is used to identify the deviation between the outputs of the experimental and numerical models. To alleviate computational burden, the numerical model and the model discrepancy function are replaced by Gaussian processes. Results indicate a significant reduction in the stiffness of concrete in the damaged state, which is identical to cracks observed on the body of the structure. The discrepancy function reaches satisfying ranges in both states, which implies that the properties of the structure are predicted accurately. Consequently, the proposed methodology contributes to a more reliable judgment about structural safety.

Item Type: Article
Identifier: 10.1177/1369433219858723
Additional Information: © 2019, © SAGE Publications
Keywords: Finite Element Model Updating, Bayesian framework, Gaussian process, Structural Health Monitoring, Box girder bridge, Vibration analysis
Subjects: Construction and engineering > Digital signal processing
Construction and engineering > Civil and structural engineering
Depositing User: Andre Jesus
Date Deposited: 11 Jun 2019 14:23
Last Modified: 06 Feb 2024 16:00


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