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    Volume 49, Issue 6 (January 2021)

    Studies on the Spatial Location Method of Corrosion Defect in Bridge Cable Considering Self-Magnetic Flux Leakage Effect

    (Received 6 June 2020; accepted 7 October 2020)

    Published Online: 22 January 2021

    CODEN: JTEVAB

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    Abstract

    To detect the hidden defects of ferromagnetic components, it is crucial to first locate the position of defects. In this paper, the three-dimensional magnetic dipole model of a solid columnar structure with a sector cube defect was built to theoretically explain the self-magnetic flux leakage effect of the bridge-stayed cable. The uniform or linear distribution of charge density on specific defect planes was considered in the model. Then, an experimental study on the defective steel strand cable specimens under different corrosion degrees was carried out. The results show that the corrosion accelerates the variation of magnetic signal Bz near the corrosion region, and the phenomenon is consistent with the theoretical model. Moreover, the relationship between the normalized signal Bznor and the corrosion factor αφ reveals the influence of the corrosion defect on the magnetic signal intensity in different detection positions, demonstrating the three-order polynomial growth trend. Combined with the axial and the circumferential scanning, the spatial location method of the corrosion defect was proposed for the detection of the bridge-stayed cable.

    Author Information:

    Xia, Runchuan
    Chongqing Jiaotong University, State Key Laboratory of Mountain Bridge and Tunnel Engineering, Nan’an, Chongqing

    Chongqing Jiaotong University, School of Civil Engineering, Nan’an, Chongqing

    Zhang, Hong
    Chongqing Jiaotong University, State Key Laboratory of Mountain Bridge and Tunnel Engineering, Nan’an, Chongqing

    Chongqing Jiaotong University, School of Civil Engineering, Nan’an, Chongqing

    Zhou, Jianting
    Chongqing Jiaotong University, School of Civil Engineering, Nan’an, Chongqing

    Liao, Leng
    Chongqing Jiaotong University, School of Materials Science and Engineering, Nan’an, Chongqing

    Di, Haibo
    Sichuan Yakang Expressway Co., Ltd., Scientific Research Project Department, Ya’an, Sichuan

    Zhang, Zeyu
    Guizhou Expressway Group Co., Ltd., Scientific Research Project Department, Guiyang, Guizhou


    Stock #: JTE20200367

    ISSN:0090-3973

    DOI: 10.1520/JTE20200367

    Author
    Title Studies on the Spatial Location Method of Corrosion Defect in Bridge Cable Considering Self-Magnetic Flux Leakage Effect
    Symposium ,
    Committee E07