Damage detection method for simply supported RC beams based on S transformation
LIU Ning 1,2，LIU Sixin 1，XI Jiaxin 2，ZHANG Xuebing 3
1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China;
2. School of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China;
3. School of Geomatics & Prospecting Engineering, Jilin Jianzhu University, Changchun 130118, China
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.
刘宁 1,2， 刘四新 1,奚佳欣 2,张雪冰 3，姜立鑫2. 基于S变换的简支梁结构损伤检测方法研究[J]. 振动与冲击, 2018, 37(9): 161-167.
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. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(9): 161-167.
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