الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 255 |  |  |
| | | from | 255 | | |
Abstract
The main goal of this thesis is concerned with studying the fatigue collapse of the steel constructions. Competents depended on each of their predecessors to develop a useful rules of thumb would be followed accordingly. There were different rules established in accordance with the mentality of each engineering sociy, some of them adopted only theoretical results on the ground, regardless of the real difference and others tried to modify the theoritical results of what is happening in reality. North America society built its visions to evaluate fatigue on an approximated way adopted the idea on the test result. it depended on certain rules that have been developed based on presenting steady steps to determine the number of stress cycles for a particuar element as the main controller factor for determining the allowable fatigue strength. On the other side of the globe, In European code of practice for steel constructions, they followed the principle away from the common the term using the S-N curve, interested in how to transfer the experimental conditions on what caused due the real loads and innovated another trend using conversion of laboratory results to its counterpart realistic one, using factors represented the possible future damage when using the actual realstic conditions. On the other side, it is mentioned another important difference, during the design process, the considerations which govern, differ between the proposed design load models that are used in the design process and other innovative models specifically for the assessment of fatigue. In Egypt, using the Allowable Stress as a design method, the competent in the Building and Construction Research Centre hasfollwed the general outlines presented in the American regulations with adapting the Egyptian nature regreding the design load models that have been the focal during the design process.Nowadays, there are attempts to adopt the Load and Resistance Factor as a design method for bridges. The fatigue assessment method in this code depended on the maximum allowable side of the European trend. The conversion process will be the experimental results to that occur in fact, identical to the vision of the European code using only the maximum allowable damage facor. Thinking for a moment and based on some statistical theories, it is possible to use experimental results of the S-N curves and innovation equations much closer to reality than those of linear equations that have been used to approximate the results. Some of the other theories like Smith theory that have been applied in the ancient times in the fatigue assessment, if adopted in the evaluation of fatigue in the global codes, we will discover new shorcomings in using the S-N curve in the fatigue assessment. And then it is possible to depend on this neglected theory to avoid these discovered shortcomings. This thesis tracks in the following order: Chapter (1): Contains an introduction for the thesis including the research objectives. Chapter (2): Covers the historical background of fatigue strength and their causes.it included a literature review of the previous work concerning this topic. Chapter (3): Clarify the process of fatigue evaluation in the European code and their used assumptions and what sets it apart from the rest of the codes and provisions under consideration with identifying its branch of a performed program using C# programming language to simplify the the vision of the European code of practice in the field of fatigue assessment process. Chapter (4): Mentions the codes are ruling the North America continient starting with the American code for steel structures and its non overall assupmtions concerning the fatigue assessment, then moving on to more specialized provisions either which is called AASHTO used in the design of highway bridges and their consideration in the fatigue assessment process in addition to their fatigue load model must be used or which is called AREMA used in the design of the Railway bridges and their considerations with a hot spot on their simple approach concerning fatigue with identifying its branch of a performed program using C# programming language to simplify the the vision of the each code of practice in North America in the field of fatigue assessment process. Chapter (5): Contains the fatigue assessment in the Egyptian Code of practice by two methods for design ”ASD,LRFD” and all factors which are considered and how to determine the allowable stress range for a specific detail category with identifying its branch of a performed program using C# programming language to simplify the the vision of the European code of practice in the field of fatigue assessment process. .Chapter (6): A comparison would be carried out between the mentioned codes and provisions with the test results conducted for large-scale specimen in National Cooperative Highway Research Program (NCHRP) specialized in these tests and developing the fatigue resistance curves in American provisions and determining the nearest code to these realistic results as well as new techniques are closer to these realistic results were developing to improve the fatigue assessment process. Chapter (7): Verification of the performed program with manuals for a live example. Chapter (8): Showing the summary and the recommendations for the future works.