This study discusses the causes of main cable sag damage on suspension bridges. Although the cable extension caused by the sag is not apparent, it has some important characteristics. One such characteristic is that the cable, being hyperbolic, contains a central region that is strictly level. If an average of points was taken along this central region, inspection accuracy could be increased. With changes in sag, the damage to the cable can be estimated. Three-dimensional (3D) scanners can accurately obtain the cloud points from the main cable of the suspension bridge in real time and in the long term. This, along with visual testing (VT), can be used to verify the study. The results obtained through laboratory and field experimentation in this study were close to the expected theoretical results.
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