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Damage Detection and Localization in Concrete Slabs Through Linear and Nonlinear Vibration Analysis
Abstract
In this study, different alternatives to detect, localize damage from linear and nonlinear vibration responses are investigated. These alternatives are compared on two concrete slabs which were subjected to two different damage types and extents. Linear and nonlinear modal test configurations were conducted. The change of linear resonant frequencies and the nonlinear behavior with damage are compared. Then, the modal shapes are leveraged for localizing the damage position in three different ways. First, the coordinate modal assurance criterion was used. Second, a local damage index is defined as the difference between the maximum principal curvatures (before and after damage) of a set of resonant modes. Third, a nonlinear based localization is proposed by weighting the modal shape curvature differences by its corresponding nonlinear parameter. The results show that linear based techniques were able to localize the damage position in the first slab (severe damage), but failed in the second one (subtle damage). The proposed nonlinear localization technique was able to detect and localize the damage position in both investigated cases.
DOI
10.12783/shm2019/32138
10.12783/shm2019/32138