Abstract：Here, to ensure health and safety of suspenders of arch bridges in service, aiming at multi-point corrosion features of suspenders, a non-reference corrosion damage identification method based on multi-point scattering echoes was proposed. Firstly, the finite element model of multi-point corrosion steel wire was established by introducing a fractal function to simulate steel wire rusty surface. Then, wavelet transform was used to extract multi-scale energy spectra of multi-point scattering echoes, the energy spectra were taken as feature vectors to construct corrosion indices, and analyze effects of guided wave frequency on corrosion recognition results. Finally, guided waves were used to detect suspenders of a certain in-service arch bridge, and the detection results were verified by destroying local PE (Polyethylene) layers. The results showed that multi-scale energy spectra of multi-point scattering echoes change significantly under different corrosion degrees, corrosion indices increase linearly with increase in corrosion degree; with increase in guided wave frequency, its identification index’s damage sensitivity rises, compared with guided wave frequency of 10 kHz, sensitivity coefficients of 50 kHz and 100 kHz increase by 6.13% and 131.902%, respectively; the actually measured corrosion indices of suspenders are obviously different, and they are distributed in range of 3.91-9.65; detecting results of PE failure tests and recognition results of corrosion indices are consistent.
陈鑫，朱劲松，林阳子，官幼平. 基于导波多点散射的在役拱桥吊杆腐蚀损伤识别[J]. 振动与冲击, 2021, 40(19): 295-301.
CHEN Xin, ZHU Jinsong, LIN Yangzi, GUAN Youping. Corrosion damage identification of suspenders of arch bridges in service based on guided wave multi-point scattering. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(19): 295-301.
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