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I. INTRODUCTIONONNECTIONS represent an important part of each structure and are more conservative than members. Given that connections are more difficult to evaluate than members, a big discrepancy exists between analysis and actual behavior. The choice to use a specific form of connection is solely that of the designer, and he should decide by knowing the behavior of connection, economy, and

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This paper presents a study for comparison between different codes which widely used globally in the calculation the allowable fatigue strength for a particular element during the design process. The fatigue assessment method, the assumptions, the considerations followed in each code will be clarified and the difference between them either in the design principle ,whether load and resistance factor method or the allowable stress design method or the factors that was taken into consideration to achieve their vision of the reality. On the other hand, an overall program is performed with C# programming language to facilitate the fatigue assessment process in each code. Also, another comparison also link those results with test result was conducted on many samples which categorized in those codes then we will reach which of code under consideration near to the founded in deed and there would be many trials to avail these test result to perform more realistic S-N curves using the high ordered polynomial equation. In addition, Some shortcomings would be indicated belong to the fatigue assessment method in the considered code using a traditional neglected theory helped formerly in the fatigue assessment and it would be adapted to the contemporary uses. Higher order proposal formula approach to the results founded in deed contained the governing variables in determining the allowable fatigue strength.