Mechanical properties of severely corroded high-strength steel wire under the high-strain low-cycle fatigue loading
Zimo Zhang,Guojin Tan,Hua Wang,Tao Yang
Abstract
As essential components in arch bridge suspenders, high-strength steel wires are highly susceptible to environmental corrosion, significantly degrading their mechanical properties. When subjected to overloading vehicles, these corroded wires experience high-strain low-cycle fatigue loading, which further accelerates their property degradation and increases the risk of premature failure. To address the issue of insufficient understanding of the mechanical behavior of corrosion-damaged high-strength steel wire under these conditions, a large arch bridge in Guangxi was selected as the case study. Through the equivalent conversion of actual environmental conditions and vehicle loads, the appropriate test parameters were determined. Systematic accelerated corrosion tests and subsequent high-strain, low-cycle fatigue loading tests were conducted on high-strength steel wires, followed by an evaluation of their residual mechanical properties. The results demonstrate that corrosion significantly reduces the ultimate tensile strength and yield strength of steel wires, with reductions of 31.68% and 34.41%, respectively, after 14 days of accelerated corrosion. The fatigue stress amplitude causes a non-monotonic variation of the ultimate tensile strength, characterized by strengthening followed by degradation. A particularly notable finding is the significant synergistic effect between corrosion and low-cycle fatigue. Under identical stress amplitude, the change in ultimate tensile strength after 14 days of corrosion was 12.15 times greater than that of uncorroded wires. These findings reveal the degradation mechanism of corroded high-strength steel wires under high-strain low-cycle fatigue, providing a theoretical foundation for condition assessment and maintenance strategies for high-strength steel wires in existing bridge suspenders.
Zimo Zhang — 1)College of Transportation, Jilin University, Changchun 130025, China 2)School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Guojin Tan — College of Transportation, Jilin University, Changchun 130025, China
Hua Wang — Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, China
Tao Yang — School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
PDF Viewer
Preview is limited to the first 3 pages. Sign in to access the full PDF.
