[PDF] Using Non-Linear Vibration Techniques to Detect Damage in Concrete Bridges


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Using Non-Linear Vibration Techniques to Detect Damage in Concrete Bridges

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Abstract:

There has been much work published in recent years on the use of vibration characteristics to detect damage in bridges. Almost all of this work has been based on the assumption that the vibration is linear, i.e. the natural frequencies are not dependent on the amplitude of oscillation. The aim of the work presented here was to investigate the possibility of using changes in the non-linear vibration characteristics to detect damage in reinforced concrete bridges. These changes in the non-linear vibration characteristics were studied by conducting impact excitation vibration tests on reinforced concrete beams.

The non-linearities were detected by examining the changes in fundamental frequency over time (and hence over amplitude of vibration). Several time-frequency distribution estimation tools are discussed including the discrete Fourier transform moving window, the auto-regressive model moving window, harmonic wavelets and examples of the Cohen class of bilinear time-frequency distributions. A detailed investigation into these various distribution
predictors was conducted to assess which is most suitable for analysing the vibration signals to detect changes in frequency with time.

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