## 4 Conclusions  
A new algorithm for corrosion fatigue damage evolution of stay cables was proposed in this paper. Therefore, the cable corrosion fatigue damage evolution can be carried out more accurately. The mechanical properties of the bridge structure were analyzed under the corrosion fracture condition of the cable. The following conclusions can be drawn from the full study.  
1. The degree of uneven distribution of steel wire stress experienced a process of first increasing and then decreasing.During most of the corrosion fatigue life of the cable, the stress distribution of the steel wire kept an increasing trend, and the increasing rate accelerated gradually with the increase of loading times. The increasing trend of stress unevenness lasted until the later period of cable corrosion fatigue life.
2. In the process of fatigue deterioration of the cable, the corrosive environment also continuously weakened the ultimate bearing capacity of the cable, and the steel wire in the cable body often broke suddenly when the damage did not reach 1.0. The corrosion fatigue life of the cable in practice largely depended on the life of the wire with the greatest initial damage.
3. Different cable-breaking positions had different effects on the stress of the main beam. The short cable fracture had little effect on the main beam. At the same time, the adjacent segment to the broken cable position will also be greatly affected, and the stress in this area will increase significantly. Adjacent segments should be controlled during cable breaking and replacement.
4. The main girder's stress obviously changed along the bridge after the cable broke. The principal stress of the main beam changed within a certain range. The effect of a long cable on the main beam was greater than that of a short cable. In operation, attention should be paid to the protection of the outer cable. The structure needs to be fully evaluated when the outer cable is replaced.
5. The maximum principal stress in the anchorage zone increased by 20% compared with the unbroken cable. It was necessary to add steel bars to the anchorage zone to prevent concrete cracking and enhance the tensile strength of the concrete in the anchorage zone.  
Conceptualization, L.W., Z.X. and W.L.; methodology, L.W., Z.X. and C.D.; software, L.W., Z.X. and N.F.; validation, L.W. and C.D.; formal analysis, Z.X. and W.L.; resources, N.F. and W.L.; data curation, W.L.; writing--review and editing, L.W., Z.X. and W.L.; project administration, L.W. and N.F.; funding acquisition, L.W., Z.X. and N.F. All authors have read and agreed to the published version of the manuscript.  
This study is supported by five key funds: The Key Research and Development Program of Heilongjiang Province, China (JD22A012, GZ20210206); The Fundamental Research Funds for the Central Universities, China (2572020 AW53, 2572019 CP02); China Railway 22 Bureau Group Co., Ltd. Science and Technology Research Project (20-01A).  
This study did not require ethical approval.  
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to privacy.  
The authors declare no conflict of interest.