A Two-Step FE Model Updating Approach for System and Damage Identification of Prestressed Bridge Girders

This study presents a two-step FE model updating approach for health monitoring and damage identification of prestressed concrete girder bridges. To reduce the effects of modeling error in the model updating process, in the first step, modal-based model updating is used to estimate linear model para...

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Veröffentlicht in:Buildings (Basel) Jg. 13; H. 2; S. 420
Hauptverfasser: Malekghaini, Niloofar, Ghahari, Farid, Ebrahimian, Hamed, Bowers, Matthew, Ahlberg, Eric, Taciroglu, Ertugrul
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Basel MDPI AG 01.02.2023
Schlagworte:
Algorithms
Analysis
Bayesian model updating
Beams (structural)
Boundary conditions
Bridges
Compressive strength
Concrete
Concrete bridges
Concrete properties
Concrete structures
Damage detection
damage identification
Damping
Estimates
Experiments
Girder bridges
Girders
I beams
I-girder
Identification
Material properties
Mathematical models
Methods
modal-based model updating
Model updating
Nonlinear response
operational health monitoring
Parameter estimation
Parameters
Prestressed concrete
Stiffness
system identification
United States > US
ISSN:2075-5309, 2075-5309
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Zusammenfassung:This study presents a two-step FE model updating approach for health monitoring and damage identification of prestressed concrete girder bridges. To reduce the effects of modeling error in the model updating process, in the first step, modal-based model updating is used to estimate linear model parameters mainly related to the stiffness of boundary conditions and material properties. In the second step, a time-domain model updating is carried out using acceleration data to refine parameters accounting for the nonlinear response behavior of the bridge. In this step, boundary conditions are fixed at their final estimates using modal-based model updating. To prevent the convergence of updating algorithm to local solutions, the initial estimates for nonlinear material properties are selected based on the first-step model updating results. To validate the applicability of the two-step FE model updating approach, a series of forced-vibration experiments are designed and carried out on a pair of full-scale decommissioned and deteriorated prestressed bridge I-girders. In the first step, parameters related to boundary conditions, including stiffness of supports and coupling beams, as well as material properties, including initial stiffness of concrete material, are estimated. In the second step, concrete compressive strength and damping properties are updated. The final estimates of the concrete compressive strength are used to infer the extent of damage in the girders. The obtained results agree with the literature regarding the extent of reduction in concrete compressive strength in deteriorated concrete structures.
Bibliographie:ObjectType-Article-1
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ISSN:2075-5309
2075-5309
DOI:10.3390/buildings13020420