其他摘要：The use of natural frequency as a diagnostic parameter in structural damage detection and vibration monitoring, has been discussed in the last decade for many authors in several works. The large use of natural frequencies and mode shapes as sensitive indicators of structural integrity is due to the fact of the ease in measuring these modal parameters experimentally. Many types of methods are employed in the state of art in damage detection and location using low frequency data. There are two classes of methods that are investigated here: the first is based on frequency sensitivity to the damage and the second one is based on optimization techniques and parametric modeling. In this work a genetic algorithm and a modal sensitivity method are used to identify and evaluate damage cases in a numerical finite element model of a portal frame. The results of the identification and the evaluation of the damage in both methods were similar and could be compared.
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