A nondestructive damage evaluation (NDE) technique, the so-called Damage Index Method, has been developed at Texas A&M University. The capability of the method to detect, locate, and estimate the severity of damage has been demonstrated utilizing both experimental and numerical modal data. The objective of this paper is to test this method in the blind mode by using the simulated data for the steel frame structure analyzed at the University of British Columbia. The blind data included the response in the time domain of the undamaged structure and the responses of the structure with two sets of damage conditions. In this paper, elements of the theory of the method utilized here for damage detection and localization is summarized. With the given data, modal analyses are performed to extract the modal characteristics (i.e., frequencies and mode shapes) for the undamaged structure (Case 1) and the damaged structures (Cases 2 and 3). The results of the modal analyses are reported. Using the proposed NDE technique, the predicted damage locations and estimation of damage severity are presented for Case 2 and Case 3.
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