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为了解悬索桥内部的腐蚀环境随外界环境的变化规律,以及影响其腐蚀程度和腐蚀速率的关键因素,该文进行了主缆足尺节段模型腐蚀试验。试验将1∶1的主缆节段模型安放于环境试验箱中,箱内循环模拟降雨过程、高温加热、通风干燥等环境循环过程。与此同时,在主缆模型内部埋置传感器,测量不同部位钢丝的温度、相对湿度及腐蚀速率等环境参数。分析数据得到主缆内温度、湿度的分布情况以及腐蚀与环境之间的关系,结论如下:1温度的测试值与传感器在主缆内埋入的深度有很大的关系,而相对湿度则不然,越靠近主缆的中心位置温度呈现线性增加,而相对湿度则线性减小;2腐蚀程度是由湿度来影响的,当增加湿度时,腐蚀程度会明显地增加近50%,腐蚀的速率主要受到温度循环的影响,腐蚀速度与温度高度地线性相关。
In order to understand the variation of corrosion environment inside the suspension bridge with the external environment and the key factors that affect its corrosion degree and corrosion rate, this paper carried out the corrosion test of the main cable segment model. In the experiment, the 1: 1 main cable segment model was placed in an environmental chamber, and the inside of the chamber simulated the environmental circulation process such as rainfall process, high temperature heating, ventilation and drying. At the same time, sensors were embedded in the main cable model to measure the environmental parameters such as temperature, relative humidity and corrosion rate of the steel wire in different parts. Analysis of the data obtained in the main cable temperature and humidity distribution and the relationship between corrosion and the environment, the conclusions are as follows: 1 temperature test value and the depth of the sensor embedded in the main cable has a great relationship, while the relative humidity is not , The closer the temperature to the center of the main cable is a linear increase in temperature while the relative humidity decreases linearly; 2 the degree of corrosion is affected by humidity, and the degree of corrosion increases significantly by nearly 50% as the humidity increases, the rate of corrosion being predominate Affected by temperature cycling, corrosion rates are highly linearly correlated with temperature.