Evaluation of Structural Condition Using Wavelet Transforms

Abstract eng:
A technique for analysis of dynamic structural response is developed based on the Wavelet Transform Method (WTM). This technique extends an earlier methodology for structures with a predominant fundamental mode, to multi-degree of freedom situations. The structural behavior is evaluated in the form of a performance curve of the predominant response, as a relationship between the equivalent force and equivalent displacement. This curve, scaled by its corresponding mass ratio may be directly compared to a seismic demand curve for the purpose of condition assessment. In this paper, the decomposition procedure of dynamic structural response using the wavelet transform method is presented. Validity of the procedure is illustrated based on an actual dynamic response data from the Vincent Thomas Bridge (VTB) during the 1987 Whittier earthquake, the 1994 Northridge earthquake, and two ambient vibration events in 2004 are studied.

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