SOLUTION FOR THE SECOND PHASE OF THE ANALYTICAL SHM BENCHMARK PROBLEM

Abstract eng:
This paper addresses the second phase of the IASC-ASCE Structural Health Monitoring (SHM) benchmark problem. This problem was created to improve the understanding of SHM techniques by comparing their performance using a common structure and set of damage cases. The structure selected for this benchmark problem is a four story 2 bay by 2 bay steel frame. Numerical models of the structures have been developed. Damage is simulated by reducing stiffness in members of the structure. The methodology presented here in uses the Natural Excitation Technique (NExT) and the Eigensystem Realization Algorithm (ERA) to identify the natural frequencies and mode shapes of the structure. Using these natural frequencies and mode shapes it is possible to determine the stiffness coefficients of structural members through a least squares solution of the eigenvalue problem. Two different identification models are used and the results are compared. The proposed methodology is shown to be effective in the detection, quantification and location of damage in civil structures.

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