M-DLAC Extension for Damage Detection on Real-World Structures

Purpose: The analysis of structural integrity and damage identification based on variations in modal parameters is critical in structural health monitoring (SHM) due to its non-destructive and continuous monitoring capabilities. This study aims to demonstrate the effectiveness of the Multiple-Damage Location Assurance Criterion (M-DLAC) as an SHM technique that relies solely on variations in natural frequencies caused by structural alterations to perform integrity assessments. Method: Using real-world data from a newly available open-source database, this study applied the M-DLAC technique to a real-world structure, marking the first time it has been tested outside of theoretical or laboratory conditions. The structure, a 9-m-high lattice tower, is equipped with reversible damage mechanisms that simulate damage by dismantling connections between beams. The data set includes one year of acceleration recordings under natural excitations. Results: The results demonstrate that the M-DLAC method can reliably identify the damaged area within the structure, pinpointing with reasonable approximation the specific removed elements that represent structural alterations. These findings validate the M-DLAC method practical effectiveness. Conclusion: This study provides novel insights into M-DLAC performance on real-world structures and highlights the need for specific adaptations when applying theoretical methods in practical scenarios. The findings serve as both a conclusion and a basis for further refinement and development of the M-DLAC technique in SHM applications.