The dynamic identification of modal parameters plays a fundamental role in structural health monitoring: mode shapes, frequencies and damping ratios can be exploited to assess the current state of a structure, used for damage detection or in numerical model validation. In recent years, vibration-based methods have become a popular solution for the state of health estimation of strategic civil infrastructures such as bridges: in particular, free vibration tests represent a fast and economic method only requiring the temporary installation of a limited number of sensors on the structure. This contribution presents a procedure for the identification of modal properties of existing bridges exploiting their free decay responses: each mode's contribution is adaptively extracted from free vibration tests data using the Empirical Fourier Decomposition and a noise-robust area-based approach is exploited to identify modal damping ratios. The method is preliminarily validated on a synthetic multi-modal signal showing excellent results even in case of closely spaced modes. The performance of the proposed approach is also tested for a real existing structure: the selected case study deals with the identification of modal parameters for a steel railway bridge deck.

Modal Parameters identification in existing bridges based on free vibration tests / Mazzeo, M; De Domenico, D; Quaranta, G; Santoro, R. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 2647:18(2024). (Intervento presentato al convegno 12th International Conference on Structural Dynamics tenutosi a Delft) [10.1088/1742-6596/2647/18/182026].

Modal Parameters identification in existing bridges based on free vibration tests

Quaranta, G;
2024

Abstract

The dynamic identification of modal parameters plays a fundamental role in structural health monitoring: mode shapes, frequencies and damping ratios can be exploited to assess the current state of a structure, used for damage detection or in numerical model validation. In recent years, vibration-based methods have become a popular solution for the state of health estimation of strategic civil infrastructures such as bridges: in particular, free vibration tests represent a fast and economic method only requiring the temporary installation of a limited number of sensors on the structure. This contribution presents a procedure for the identification of modal properties of existing bridges exploiting their free decay responses: each mode's contribution is adaptively extracted from free vibration tests data using the Empirical Fourier Decomposition and a noise-robust area-based approach is exploited to identify modal damping ratios. The method is preliminarily validated on a synthetic multi-modal signal showing excellent results even in case of closely spaced modes. The performance of the proposed approach is also tested for a real existing structure: the selected case study deals with the identification of modal parameters for a steel railway bridge deck.
2024
12th International Conference on Structural Dynamics
Free vibrations; Operational modal analysis; Structural health monitoring
04 Pubblicazione in atti di convegno::04c Atto di convegno in rivista
Modal Parameters identification in existing bridges based on free vibration tests / Mazzeo, M; De Domenico, D; Quaranta, G; Santoro, R. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 2647:18(2024). (Intervento presentato al convegno 12th International Conference on Structural Dynamics tenutosi a Delft) [10.1088/1742-6596/2647/18/182026].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1717006
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