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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. یهدف البحث إلى دراسة مقارنة بین نتائج أکواد التصمیم المختلفة والمستخدمة عالمیا على نطاق واسع فى حساب تأثیر حمل الکلال على المنشآت المعدنیة وإجهاد الکلال المسموح به لعنصر معین إثناء عملیة التصمیم. وسیتم توضیح طرق تقییم الکلال المتبعه فى کل کود والافتراضات التى قد بنیت علیها عملیة التقییم والتى ستختلف فیما بینها فى مبدأ التصمیم سواء طریقة الحدود القصوى او طریقة حد التشغیل و العوامل المأخوذه فى الاعتبار فى کل کود للوصول الى درجة واقعیه خاصه به ذلک من ناحیة ومن ناحیة اخر عمل برناج تجمیعى بلغة برمجة السى شارب یشمل طرق تقییم الکلال المتبعه فى کل کود و ایضا ستیم الربط بین نتائج المقارنه تلک و نتائج اختبارات عملیة تم اجراؤها على بعض العینات ذات التصنیف فى تلک الأکواد ومن هنا سوف یتم الوصول الى أى الاکواد موضوع الدراسة اقرب نتائج الى الواقع . وبالاضافه الى ذلک سیتم مناقشة  بعض القصور قد وجدت فى طرق التقییم المتبعه فى الاکواد موضوع الدراسه باستخدام أولى النظریات التى استخدمت قدیما لتقییم الکلال التى سیتم تطویعها للاستخدام المعاصر. وسوف یتم اقتراح صیغه اخرى اکثر قربا للواقع  تربط المتغیرات التى تتحکم فى تحدید إجهاد الکلال المسموح به.

COMPARISON BETWEEN DIFFERENT CODES IN CALCULATION OF THE EFFECT OF FATIGUE ON STEEL STRUCTURES