English：

In response to the practical demands of safety inspection and long⁃term operation andmaintenance of cable structures, the core principles and applicable scenarios of six types of cable forceidentification technologies are systematic ally, with a particular focus on the three⁃point bending methodfor cable force identification. The current technological development status and the design progress of theassociated instruments are analyzed. On this basis, the key factors influencing the accuracy of thismethod from critical dimensions such as initial error, lateral displacement, stripping length, and physicalflexural rigidity are analyzed. The research results indicate that each type of cable force identificationtechnology has a clear applicable boundary, and currently, dedicated cable force testing technologies forexisting cable structures are still relatively scarce. Although the three⁃point bending method has atechnical bottleneck in the detection of large⁃diameter tension cables, it is widely applied in engineeringpractice due to its unique advantages, especially for the cable force detection of existing cable structures.Additionally, to enhance the accuracy and applicability of the three⁃point bending method in cable forcetesting, it is necessary to not only reasonably control the on⁃site usage conditions but also further optimizethe instrument structure design and improve the theoretical correction methods, providing technicalsupport for the long⁃term safe operation and maintenance of cable structures.