Method and system for evaluating residual life of steel wire in service pull sling anchoring area

Abstract

The invention discloses a method and a system for evaluating the residual life of a steel wire in a service pull sling anchoring area, and relates to the technical field of bridges, and the method comprises the following steps: determining a to-be-evaluated cable body steel wire in the service pull sling anchoring area; determining the defect size corresponding to the steel wire in the service pull sling anchoring area by adopting a three-dimensional laser scanning technology; according to the defect size, determining the development stage of the steel wire in the service pull sling anchoring area; and according to the development stage, determining the remaining life of the steel wire in the service pull sling anchoring area. According to the invention, the purpose of accurate evaluation can be achieved.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a method and system for evaluating the remaining life of a steel wire in an anchorage area of ​​a sling in service based on a dry-wet alternating corrosion environment. Background technique [0002] The pull sling is composed of a cable body, a protection system and an anchor system. The beam load is transmitted to the main cable, cable tower or arch tower through the sling; the cable body mainly bears the tension, and the protection system and anchorage system are the guarantee for the normal operation of the cable body in the service environment. Scholars at home and abroad have done a lot of research on the sling, and achieved fruitful results, which greatly promoted the optimization of the form of the sling and the improvement of maintenance technology, but there are some limitations as follows: [0003] ① Existing studies have focused on the effects of corrosion, fatigue, a...

AI Technical Summary

Problems solved by technology

[0003] ① Existing studies have focused on the effects of corrosion, fatigue, and broken wires on the load-carrying capacity of the cable body where the outer sheath is damaged. However, the damage is more subtle and serious. The effect of formation and propagation and the service life under this condition are rarely studied

[0004] ②The main random loads borne by the sling during service are vehicle loads and wind loads. The effects of vehicle loads and wind loads cannot be ignored when studying the service conditions of slings; The effect of random load is ignored; or the effect of random load is considered, but the service environment is lacking, especially the influence of the alternating dry and wet corrosion environment in the anchorage area. The corrosion-fatigue loss of the pull-down sling under the coupling effect Mechanism not involved

[0005] ③ Existing results have qualitatively studied the impact of rainwater entering the cable body from the damaged part of the outer sheath after the failure of the outer protective system, and the fatigue of the cable body at that place. No research has been done on the coupling of random service loads and the alternating wet and dry corrosion environment in the anchorage area The corrosion-fatigue damage mechanism and service life of the pull-down sling cannot fully reflect the service status of the pull-down sling

Images