Verification of joint input-state estimation by means of a full scale experiment on a footbridge

K Maes, G de Roeck, G Lombaert, K van Nimmen, Eliz-Mari Lourens, A Rezayat, P Guillaume

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This paper presents a verification of a state-of-the-art joint input-state estimation algorithm using data obtained from in situ experiments on a footbridge. A dynamic model of the footbridge is based on
a detailed finite element model that is calibrated using a set of experimental modal characteristics. The joint input-state estimation algorithm is used for the identification of two impact, harmonic, and swept sine forces applied to the bridge deck. In addition to these forces, unknown stochastic forces, such as wind loads, are acting on the structure. These forces, as well as measurement errors, give rise to uncertainty in the estimated forces and system states. Quantification of the uncertainty requires determination of the power spectral density of the unknown stochastic excitation, which is identified from the structural response under ambient loading. The verification involves comparing the estimated forces with the actual, measured forces. Although a good overall agreement is obtained between the estimated and measured forces, modeling errors prohibit a proper distinction between multiple forces applied to the structure for the case of harmonic and swept sine excitation.
Original languageEnglish
Title of host publicationLife-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure
Subtitle of host publicationProceedings of the 5th International Symposium on Life-Cycle Engineering, Delft, Netherlands
EditorsJaap Bakker, Dan M. Frangopol, Klaas van Breugel
PublisherTaylor & Francis
Number of pages8
ISBN (Electronic)978-1-4987-7701-8
ISBN (Print)978-1-138-02847-0
Publication statusPublished - 2016
Event5th International Symposium on Life-Cycle Engineering: Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - Delft, Netherlands
Duration: 16 Oct 201620 Oct 2016
Conference number: 5

Publication series

NameLife-Cycle of Civil Engineering Systems
PublisherCRC Press


Conference5th International Symposium on Life-Cycle Engineering
Abbreviated title IALCCE 2016
Internet address


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