Detecting structural changes with the one-step FE model updating technique

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Abstract

Differently from the sensitivity based finite element (FE) model updating technique in which the discrepancies between the FE and experimental modal properties are reduced iteratively by modifying the FE modelling assumptions, the one-step FE model updating technique based on modal orthogonality and the local correspondence (LC) principle updates the FE model in a single step. When updating an FE model with the one-step updating approach, it is assumed that the discrepancies between a FE model and the (physical) modelled structure are small and distributed over the model's degrees of freedom. If this assumption is fulfilled, it is verified that the one-step method efficiently updates the FE model, so that its modal properties match very well the ones obtained from experimental vibration tests. In this paper, the performance of the one-step updating technique in detecting localized changes is investigated by means of a practical application example in which the experimental modal properties of a t-shaped steel structure are used to update the corresponding FE model.
Original languageEnglish
Title of host publicationProceedings of the 8th Iomac - International Operational Modal Analysis Conference
PublisherIOMAC
Publication date2019
Pages263-271
ISBN (Electronic)9788409049004
Publication statusPublished - 2019
Event8th International Operational Modal Analysis Conference - Admiral Hotel, Copenhagen, Denmark
Duration: 12 May 201915 May 2019
Conference number: 8

Conference

Conference8th International Operational Modal Analysis Conference
Number8
LocationAdmiral Hotel
CountryDenmark
CityCopenhagen
Period12/05/201915/05/2019

Cite this

Caballero, A. L., Amador, S. D. R., Andersen, S., Poulsen, S. P. N., & Brincker, R. (2019). Detecting structural changes with the one-step FE model updating technique. In Proceedings of the 8th Iomac - International Operational Modal Analysis Conference (pp. 263-271). IOMAC.