Abstract: This article aims to identify multiple cracks of a structure under the act of moving load by using wavelet analysis based on displacement signal. Among many researches on this topic, the current study presents three new salient points. Firstly, the breakthrough is the combination of two independent algorithms in wavelet analysis of deflection signal’s static and dynamic elements using deep learning. The static elements allow determining quantity as well as location of defects in structures while the dynamic elements help to assess growth rate of defects during structural operation. Secondly, wavelet analysis is conducted based on deflection signal, which is rarely used but has a great deal of information proving the existence of cracks in a structure. This signal can also be applied to various types of structures such as plate, beam, bar and pivot. Thirdly, original signals are analyzed directly using wavelet analysis without any intermediate algorithm. This gives simpler and more accurate assessment of crack status, therefore, helps to increase sensitivity as well as data accuracy during identification process, especially for structures with multiple cracks. This study concurrently identifies all three criteria of defect assessment, namely: quantity, location and growth rate. In addition, the results have high potential for practical application to most structures.
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