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Abstract

At present, research on the residual fatigue life of corroded steel wires usually adopts the method of equivalent simulation of typical pits into prefabricated single cracks for treatment. However, in the actual corroded steel wires of bridge cables, multiple typical pits are often adjacent, and the effect of multiple pits on the residual fatigue life is not clear. Therefore, it is necessary to study the distribution of multiple pits on the residual fatigue life of steel wires. This paper analyzed and studied the influence of different axial distances and circumferential angles of double pits on the fatigue life of steel wires by transforming double pits into equivalent double prefabricated cracks. The experimental results show that under smaller axial distance between double cracks, the residual fatigue life of the steel wires is greater than that of a single crack. The residual fatigue life of steel wires decreases with the increasing axial distance of double-crack steel wires. The influence of the circumferential angle of double cracks on the fatigue life of steel wires has significant discreteness. In the case of lateral distribution, the residual fatigue life of single and double cracks is basically the same, with the residual fatigue life of steel wires being the smallest. Additionally, the residual fatigue life of double cracks is significantly improved under vertical distribution. Under distribution on the same side, a significant influence is exerted on the residual fatigue life of the steel wires, with the highest residual fatigue life. However, regardless of the crack distribution patterns, the mutual influence between the two gradually decreases with the increasing axial distance. When the distance between the double pits is large enough, the effect on the overall residual fatigue life of steel wires is basically equivalent to that of a single crack. Therefore, simulating the typical situation of multiple adjacent pits as a single crack evaluation method is conservative, and further research is needed to investigate its influence on residual fatigue life.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.020

First Page

127

Last Page

132

Submission Date

March 2025

Reference

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