针对常规技术难以高效检测桥梁斜拉索内部腐蚀的问题，探讨了拉索腐蚀与环向漏磁信号的关系，采用钢绞线束模拟工程常用的平行钢绞线索，设计了不同腐蚀程度及腐蚀位置的单点腐蚀和两点腐蚀检测试验，绘制出钢绞线束环向漏磁信号雷达图并分析了其规律特征。结果表明：单点腐蚀处的环向漏磁信号雷达图出现异常极大值，且腐蚀程度与极值呈正相关性；当两腐蚀点沿环向相邻时，雷达图呈“异常凸起状”；当两腐蚀点沿径向相邻时，雷达图分布均匀呈“水滴状”；当两腐蚀点分布在对角时，雷达图呈“缺口状”；根据各图像特征的显著差异，可判断单点腐蚀的环向位置和两点腐蚀的相对位置分布，由此提出了基于“3D雷达图”的斜拉索腐蚀位置检测方法。

It is difficult to effectively detect the internal corrosion of bridge stay cables by conventional technology. Aiming at the problem, the relationship between the corrosion of stay cables and the circumferential magnetic flux leakage signal is discussed in this paper. The steel strand bundles were used to simulate the parallel steel strand cables in practical engineering. The detection experimental study on the single and two corrosion points were designed under different corrosion degrees and corrosion location distributions. The circumferential magnetic flux leakage signals of steel strand bundles were plotted into radar images for analysis. The results showed that the radar image of circumferential magnetic flux leakage exhibited abnormal maximum at the single corrosion point, and the corrosion degree was positively correlated with the extreme value. When two corrosion points were adjacent along the circumferential direction, the radar image was presented as "abnormally convex". When two corrosion points were adjacent along the radial direction, the radar image was evenly distributed as "water drop". When two corrosion points were distributed diagonally, the radar image was similar to "notch". According to the obvious differences of each image feature, the circumferential position of single-point corrosion and the relative position distribution of two-point corrosion could be judged. Moreover, a detection method of the cable corrosion position based on "3D radar image" was proposed.