Abstract
To study the corrosion degradation of cable wires in a bridge’s life, this research work created an accelerated corrosion test device, which sought to identify an optimal constant strain level. An accelerated corrosion test was carried out and the corroded specimens were scanned using super depth 3D microscopy technology. Mass loss and minimum cross-sectional diameter was measured to understand the degradation characteristics of cable wires at variable strains and corrosion time. The variation of elastic modulus, yield load, and ultimate load of corroded wires, subjected to a tensile test, were analyzed. The experimental results illustrate that the average mass loss ratio of the corroded cable wires increases nonlinearly as corrosion time increases. The higher the stress level, the more serious the corrosion level. The minimum cross-sectional diameter has good correlation with corrosion time and stress level. The elastic modulus of wires does not change significantly with the increase of corrosion time. Yield load and ultimate load decreases with the increase of strain level, and the rates of decline under different strains are nonlinear.
Highlights
High-strength steel wires play a pivotal role in the construction of modern large-span suspension bridges
The depth from defocus (DFD) technology was used to properties of high-strength steel wire with a macroscopic curvature cannot be accurately scanned in low magnification
Based on the curve of tensile force and elongation, the yield loads of high-strength wires wires under under small levels strain change levels change with the increasing corrosion time; has an small strain slightlyslightly with the increasing corrosion time; it has anit obvious obvious of yield loadsμε atand με and Theload ultimate load andelongation ultimate variationvariation of yield loads at 2000 με strain ultimate and ultimate elongation of high-strength wires under the same strain level decrease with corrosion time, indicating of high-strength wires under the same strain level decrease with corrosion time, indicating a adeterioration deteriorationofofthe themechanical mechanical behavior such wires due to the corrosion
Summary
High-strength steel wires play a pivotal role in the construction of modern large-span suspension bridges. Over time, the wires in the main cable corrode and degrade, causing safety hazards. Addressing this corrosion has become a hot issue in the engineering field worldwide. Since the stress of the main cable in suspension bridges is generally between 500 MPa and 600 MPa, researchers have studied the effects of strain levels on corrosion rate. Test results by Barton [11] and Nakamura [12,13] show that tension has little effect on steel corrosion, while a test by Li [14] and Yang [15] show that strain levels can accelerate the corrosion rate of steel wire. Scanned by using ultra-depth 3D microscopy technology, the corrosion degradation law of high-strength steel wires in the main cable was studied with different strain levels and corrosion times. Static tensile tests were performed to explore the correlation between the corrosion degree and mechanical properties of cable wires
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