Proceedings of the 7th International Workshop on Structural Health Monitoring vol:2 pages:1343-1350
IWSHM edition:7th location:Stanford University date:9-11 September 2009
A non-model based method is proposed to detect and locate linear damage on spring and beam like structures. The method uses mode and frequency sensitivities to detect and locate damage; these sensitivities are estimated with experimental modes and frequencies from the undamaged structure. Thus, no numerical model of the structure is required. Damage is assumed to be directly related to a decrease in stiffness. The approach is verified with two experimental cases. First, an eight degree of freedom spring system. Second, a multi-cracked reinforced concrete beam. In both cases, results are compared with those obtained with the damage index (strain energy) method. The proposed method shows a better behavior with multiple damage and noisy conditions. The detected damage corresponds well to the real damage patterns.