Abstract
Damage can be detected by vibration responses of a structure. Damage changes the modal properties such as natural frequencies, mode shapes, and damping ratios. Natural frequency is one of the most frequently used damage indicators. In this paper, the natural frequency is used to monitor damage in a free-free beam. The modal properties of the intact free-free beam are identified based on 15 accelerometers setup. A finite element model is used to model the free-free beam. Three models are considered: beam (1D), shell (2D) and solid (3D). The numerical models are updated based on the first seven bending natural frequencies. The free-free beam is damaged by a rectangle cut. The experiment is re-setup and the model properties of the damaged beam are re-identified. The cuttings are modeled in the numerical model. The first seven numerical bending natural frequencies of the damaged beam are compared with the experimental ones. The results showed that the 1D beam element model has the highest differences, while the 2D and 3D models have approximately the same results. Therefore, the 2D representation can be used to model the damaged beam for fast computation.
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Acknowledgements
This research is funded by National University of Civil Engineering (NUCE) under grant number 11-2020/KHXD-TĐ. The authors acknowledge the financial support of VLIR-UOS TEAM Project, VN2018-TEA479A103, ‘Damage assessment tools for Structural Health Monitoring of Vietnamese infrastructures’ funded by the Flemish Government.
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Nguyen, D.H., Ho, V.L., Bui-Tien, T., De Roeck, G., Abdel Wahab, M. (2021). Damage Evaluation of Free-Free Beam Based on Vibration Testing. In: Abdel Wahab, M. (eds) Proceedings of the 8th International Conference on Fracture, Fatigue and Wear . FFW 2020 2020. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-9893-7_3
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DOI: https://doi.org/10.1007/978-981-15-9893-7_3
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