Automated Modal Analysis for Tracking Structural Change during Construction and Operation Phases
Open Access
- 22 February 2019
- Vol. 19 (4), 927
- https://doi.org/10.3390/s19040927
Abstract
The automated modal analysis (AMA) technique has attracted significant interest over the last few years, because it can track variations in modal parameters and has the potential to detect structural changes. In this paper, an improved density-based spatial clustering of applications with noise (DBSCAN) is introduced to clean the abnormal poles in a stabilization diagram. Moreover, the optimal system model order is also discussed to obtain more stable poles. A numerical simulation and a full-scale experiment of an arch bridge are carried out to validate the effectiveness of the proposed algorithm. Subsequently, the continuous dynamic monitoring system of the bridge and the proposed algorithm are implemented to track the structural changes during the construction phase. Finally, the artificial neural network (ANN) is used to remove the temperature effect on modal frequencies so that a health index can be constructed under operational conditions.Keywords
Funding Information
- National Natural Science Foundation of China (51878226)
- Shenzhen Science and Technology Innovation Commission (JCYJ20160531193340540)
- Natural Science Foundation of Guangdong Province (2017A030313292)
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