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6 April 2012Multiscale model updating of a curved highway bridge
Finite element model updating based on a multi-scale data is demonstrated on a skewed in-service highway bridge.
The multi-scale data approach provides an evidence-based method to create a bound of model class to ensure that
the optimum model retains physical connectivity to the real structure. The need for this hybrid approach to model
selection comes from the challenges of applying model updating to online structural health monitoring (SHM)
strategy based on output-only measurements of in-service highway bridges, which should consider various
uncertainties. In vibration-based FE model updating methods, the optimum model is selected by minimizing the
error between modal parameters of the model and the real structure. A major drawback of model selection is the
probability that the optimum model has no physical connectivity with the real structure. This is because a large set
of updating parameters is required to increase accuracy. In this paper, an evidence-based approach to model
selection using temperature-induced tilts is implemented in which the cyclical static behavior of a bridge is used to
create a bound of possible models. This approach has a strong potential to be applicable to large civil structures with
sparse array of sensors.
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Priscilla Mensah-Bonsu, Shinae Jang, "Multiscale model updating of a curved highway bridge," Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 834547 (6 April 2012); https://doi.org/10.1117/12.915583