Assessing the influence of fire damage on the modal characteristics of reinforced concrete beams
- Author
- Edwin Reynders, Jasper Godeau, Balša Jovanović (UGent) , Menno van de Velde, Dimitrios Anastasopoulos, Geert Lombaert, Robby Caspeele (UGent) and Ruben Van Coile (UGent)
- Organization
- Project
- Abstract
- In this work, the influence of a fire event on the dynamic structural characteristics of concrete members is investigated. A set of reinforced concrete beams have been subjected to a fire exposure of moderate structural severity. The beams were simultaneously loaded in a four-point bending test setup to mimic structural loading. Before and after the fire test, the beams were subjected to a modal test, using both accelerometers and fiber-optic Bragg grating strain sensors. While the fire did not result in significant changes in the eigenfrequencies and displacement mode shapes, the strain mode shapes were clearly affected. The neutral axis positions under bending deformation, which could be derived from the strain mode shapes, exhibited significant shifts in the zone that had been exposed to fire. The nature of the shift can be explained by thermal and subsequent nonlinear structural finite element modeling of the fire event. This effect can therefore be exploited when assessing the capacity of a structural member in post-fire condition.
- Keywords
- modal testing, fiber-optic sensing, damage identification
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-01K7ER15WS8EK4FWNP6HQE2QH5
- MLA
- Reynders, Edwin, et al. “Assessing the Influence of Fire Damage on the Modal Characteristics of Reinforced Concrete Beams.” EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1, Springer, 2025, pp. 422–31, doi:10.1007/978-3-031-96110-6_40.
- APA
- Reynders, E., Godeau, J., Jovanović, B., van de Velde, M., Anastasopoulos, D., Lombaert, G., … Van Coile, R. (2025). Assessing the influence of fire damage on the modal characteristics of reinforced concrete beams. EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1, 422–431. https://doi.org/10.1007/978-3-031-96110-6_40
- Chicago author-date
- Reynders, Edwin, Jasper Godeau, Balša Jovanović, Menno van de Velde, Dimitrios Anastasopoulos, Geert Lombaert, Robby Caspeele, and Ruben Van Coile. 2025. “Assessing the Influence of Fire Damage on the Modal Characteristics of Reinforced Concrete Beams.” In EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1, 422–31. Springer. https://doi.org/10.1007/978-3-031-96110-6_40.
- Chicago author-date (all authors)
- Reynders, Edwin, Jasper Godeau, Balša Jovanović, Menno van de Velde, Dimitrios Anastasopoulos, Geert Lombaert, Robby Caspeele, and Ruben Van Coile. 2025. “Assessing the Influence of Fire Damage on the Modal Characteristics of Reinforced Concrete Beams.” In EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1, 422–431. Springer. doi:10.1007/978-3-031-96110-6_40.
- Vancouver
- 1.Reynders E, Godeau J, Jovanović B, van de Velde M, Anastasopoulos D, Lombaert G, et al. Assessing the influence of fire damage on the modal characteristics of reinforced concrete beams. In: EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1. Springer; 2025. p. 422–31.
- IEEE
- [1]E. Reynders et al., “Assessing the influence of fire damage on the modal characteristics of reinforced concrete beams,” in EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1, Porto, Portugal, 2025, pp. 422–431.
@inproceedings{01K7ER15WS8EK4FWNP6HQE2QH5,
abstract = {{In this work, the influence of a fire event on the dynamic structural characteristics of concrete members is investigated. A set of reinforced concrete beams have been subjected to a fire exposure of moderate structural severity. The beams were simultaneously loaded in a four-point bending test setup to mimic structural loading. Before and after the fire test, the beams were subjected to a modal test, using both accelerometers and fiber-optic Bragg grating strain sensors. While the fire did not result in significant changes in the eigenfrequencies and displacement mode shapes, the strain mode shapes were clearly affected. The neutral axis positions under bending deformation, which could be derived from the strain mode shapes, exhibited significant shifts in the zone that had been exposed to fire. The nature of the shift can be explained by thermal and subsequent nonlinear structural finite element modeling of the fire event. This effect can therefore be exploited when assessing the capacity of a structural member in post-fire condition.}},
author = {{Reynders, Edwin and Godeau, Jasper and Jovanović, Balša and van de Velde, Menno and Anastasopoulos, Dimitrios and Lombaert, Geert and Caspeele, Robby and Van Coile, Ruben}},
booktitle = {{EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL ENGINEERING STRUCTURES, EVACES 2025-VOL 1}},
isbn = {{9783031961090}},
issn = {{2366-2557}},
keywords = {{modal testing,fiber-optic sensing,damage identification}},
language = {{eng}},
location = {{Porto, Portugal}},
pages = {{422--431}},
publisher = {{Springer}},
title = {{Assessing the influence of fire damage on the modal characteristics of reinforced concrete beams}},
url = {{http://doi.org/10.1007/978-3-031-96110-6_40}},
year = {{2025}},
}
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