预腐蚀桥梁缆索高强钢丝疲劳试验

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

摘要:

为了研究桥梁缆索高强钢丝腐蚀后的疲劳性能，采用酸性盐雾试验制作了6种不同腐蚀程度的钢丝试件共30根，并对这些试件进行了单轴拉伸疲劳试验.分析了腐蚀程度、应力水平对高强钢丝的影响，研究了预腐蚀桥梁缆索高强钢丝的疲劳性能退化规律.试验结果表明：腐蚀使得钢丝的疲劳寿命显著降低，腐蚀下的高强钢丝应力疲劳寿命曲线仍呈双直线形式，在相同应力幅下，钢丝疲劳寿命对数值随质量损失率线性降低.通过试验数据建立了预腐蚀桥梁缆索高强钢丝的疲劳曲面方程，并给出了不同保证率以及失重率下的钢丝疲劳强度建议值.

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．