Damage detection method for simply supported RC beams based on S transformation

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 161-167.

LIU Ning 1,2，LIU Sixin 1，XI Jiaxin 2，ZHANG Xuebing 3

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Abstract

With the signal acquisition and processing technology, the sensor technology, and the wireless communication technology’s continuing to make progress, a lot of studies are made to use vibration response signals to detect damages occurring in structures. The signal processing method is one of important means for structural damage detection based on vibration response signals, its purpose is to extract small changes in vibration signals to identify and quantify damage’s levels in structures. S transformation is a short time Fourier transformation (STFT) with a variable window or an extension of wavelet transformation (WT). Here, in a test, a concentrated load was exerted at the middle of a simply supported RC beam with the stepwise equal amount loading method. The vibration response signals after each step unloading were collected using a hammer excitation. Then the vibration data of the RC beam before damage and after damage were processed with S transformation. The test results showed that the obtained time-frequency spectra of the vibration signals and their time-frequency spectral energy E after using S transformation qualitatively and quantitatively describe crack’s developing at the middle position of the simply supported beam with increase in load, the energy attenuation step by step during elastic wave passing through, and the energy significant increase during the beam being completely destroyed; the effectiveness and feasibility of S transformation method for damage recognition of simply supported beams under different load conditions are also verified.

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damage detection / S transformation / simply supported reinforced concrete (RC) beam / vibration signal

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LIU Ning 1,2，LIU Sixin 1，XI Jiaxin 2，ZHANG Xuebing 3. Damage detection method for simply supported RC beams based on S transformation[J]. Journal of Vibration and Shock, 2018, 37(9): 161-167

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