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Detection of Reduced Flexural Rigidity in Beam through Continuous Wavelet Transform

Kanmani S S, Umesha P K, Arjun V

Abstract


In damage detection techniques based on Non-Destructive Testing (NDT) methods, signal processing tools are used to enhance the output of experimental techniques and modal analysis. The damage identification of civil engineering structures is carried out using wavelet analysis of the structural response. This new procedure is discussed in this study. The damage or crack in a structure will cause distress at the damage location.  The identification of these damages can be done using the structural response viz. deflection, modes shapes of the structures. The signal of structural response will have discontinuity at the damage locations. This local discontinuity is not noticeable in the response data. But it can be found easily by wavelet analysis. The proposed new technique is explained with numerical example of simulated beam containing a short transverse crack. This is part of structural health monitoring of structures. The structural response i.e. static deflection of beams are obtained using by finite element analysis. The wavelet analysis of structural response in simply supported and fixed beam is carried out using MATLAB’s wavelet tools.


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References


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