Experiment Research on Fatigue Performance of Pre-Corroded High-Strength Bridge Wires

Abstract:

In order to investigate the fatigue properties of precorroded highstrength bridge wires, a total of 30 steel wire specimens on six corrosion levels were prepared by using the acetic acid salt spray test. Fatigue tests were conducted with the specimens. The effects of corrosion level and stress amplitude were analyzed and the law of fatigue strength degradation was studied. The test results show that the fatigue life of bridge wires decreases significantly under corrosion. Bilinear SN curves of precorroded bridge wires were established and the logarithm of fatigue life decreased linearly with the weight loss at the same stress. Finally, the fatigue surface equations of precorroded highstrength bridge wires were established based on the test results and the recommended fatigue strength at different assure rates were proposed．