Test study on underwater monitoring of corrosion and wire breakage of prestressed concrete beam
SHANG Feng1, SONG Wenjie1, HAN Jinsheng2, YANG Bo1, FU Yao3, XU Longhai4
1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038， China；
2.School of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China;
3.Physical Acoustics Corp.Beijing Office, Beijing 100029, China;
4.Allian Stream Photonics Technology Co., Ltd., Wuxi 214000, China
Abstract：To obtain the actual acoustic emission signal of the corrosion fracture of prestressing steel in concrete beam, the galvanostatic method is applied to simulate the natural corrosion and artificially accelerate the process. High frequency acoustic emission sensors and distributed optical fiber monitoring system are used to collect the acoustic signals underwater when prestressed steel wires are broken. Signal are statistically analyzed in time domain and time-frequency domain. Test results show that only the time domain statistic characteristics below 20kHz can be used to identify the wire fracture, as the frequency dispersion occurs when the ultrasonic band of the wire-breakage signal propagates in the water. The fracture signal propagating in water can be received by the armored optical cable, which appears as a vertical band in the time-frequency diagram, and the energy is mainly concentrated in 100~ 200Hz. Small threshold should be set to intercept the signal from optical fiber monitoring system for the statistical analysis in time domain. For underwater condition, the signal-to-noise ratio of the peak index is low, and the margin and kurtosis index are more suitable for identifying fracture signal. This research lays the foundation for the development of underwater acoustic optical fiber monitoring system of prestressed concrete structure.
商峰1，宋文杰1，韩金生2，杨波1，付垚3，徐龙海4. 预应力混凝土梁腐蚀断丝水下监测试验研究[J]. 振动与冲击, 2024, 43(3): 305-310.
SHANG Feng1, SONG Wenjie1, HAN Jinsheng2, YANG Bo1, FU Yao3, XU Longhai4. Test study on underwater monitoring of corrosion and wire breakage of prestressed concrete beam. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(3): 305-310.
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