A formula is proposed to predict fatigue strength of corroded members and joints of steel structures. The concept of the formula is first studied from recently identified mechanism of corrosion fatigue. Hence, the corresponding fatigue strength curve (i.e. S‐N curve) of corroded steel is presented. It is further improved to derive linear, bilinear or trilinear S‐N curve for corroded constructional details of steel structures. The parameters of the corroded steel S‐N curve are determined based on the corrosion fatigue testing results of different types of steel specimens in air, fresh water and seawater. Hence, the parameters for the derived S‐N curve of corroded constructional details are predicted based on the above parameters and tabulated for the detail categories given in the Eurocode and DNVGL code. The proposed S‐N curve formula is compared with full‐scale fatigue test results of several constructional details, and the validity of the formula is confirmed.

中文翻译：

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腐蚀结构细节的疲劳强度退化：SN曲线的公式

提出了一个公式来预测钢结构被腐蚀的构件和接头的疲劳强度。首先从最近发现的腐蚀疲劳机理研究该公式的概念。因此，给出了腐蚀钢的相应疲劳强度曲线（即S‐N曲线）。对于钢结构的腐蚀构造细节，可以进一步改进以得出线性，双线性或三线性S‐N曲线。根据不同类型的钢试样在空气，淡水和海水中的腐蚀疲劳测试结果确定腐蚀的钢S-N曲线的参数。因此，根据上述参数预测腐蚀的结构细节的S–N曲线的参数，并将这些参数列表化为Eurocode和DNVGL代码中给出的细节类别。