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Computation-effective structural performance assessment using Gaussian process-based finite element model updating and reliability analysis

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journal contribution
posted on 30.05.2022, 11:31 authored by Hans Moravej, Tommy HT Chan, Andre JesusAndre Jesus, Khac-Duy Nguyen
Structural health monitoring data has been widely acknowledged as a significant source for evaluating the performance and health conditions of structures. However, a holistic framework that efficiently incorporates monitored data into structural identification and, in turn, provides a realistic life-cycle performance assessment of structures is yet to be established. There are different sources of uncertainty, such as structural parameters, computer model bias and measurement errors. Neglecting to account for these factors results in unreliable structural identifications, consequent financial losses, and a threat to the safety of structures and human lives. This paper proposes a new framework for structural performance assessment that integrates a comprehensive probabilistic finite element model updating approach, which deals with various structural identification uncertainties and structural reliability analysis. In this framework, Gaussian process surrogate models are replaced with a finite element model and its associate discrepancy function to provide a computationally efficient and all-round uncertainty quantification. Herein, the structural parameters that are most sensitive to measured structural dynamic characteristics are investigated and used to update the numerical model. Sequentially, the updated model is applied to compute the structural capacity with respect to loading demand to evaluate its as-is performance. The proposed framework’s feasibility is investigated and validated on a large lab-scale box girder bridge in two different health states, undamaged and damaged, with the latter state representing changes in structural parameters resulted from overloading actions. The results from the box girder bridge indicate a reduced structural performance evidenced by a significant drop in the structural reliability index and an increased probability of failure in the damaged state. The results also demonstrate that the proposed methodology contributes to more reliable judgment about structural safety, which in turn enables more informed maintenance decisions to be made.

Funding

Development of Intelligent Structures that can Self-evaluate Deterioration

Australian Research Council

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History

School

  • Architecture, Building and Civil Engineering

Published in

International Journal of Structural Stability and Dynamics

Volume

20

Issue

10

Publisher

World Scientific Publishing

Version

AM (Accepted Manuscript)

Rights holder

© World Scientific Publishing

Publisher statement

Electronic version of an article published as International Journal of Structural Stability and Dynamics, 20, 10, 2020, 2042003 https://doi.org/10.1142/s0219455420420031 © copyright World Scientific Publishing Company https://www.worldscientific.com/worldscinet/ijssd

Acceptance date

03/07/2020

Publication date

2020-09-13

Copyright date

2020

ISSN

0219-4554

eISSN

1793-6764

Language

en

Depositor

Dr Andre Jesus. Deposit date: 27 May 2022

Article number

2042003