| F Jack-up platform, known as mobile drilling unit, are widely used in the area of globaloffshore oil and gas development. So the structural strength should be checked under theconditions of its own gravity plus fixed loads on the other devices, such as wind loads, waveloads and flow of ice loads. Meanwhile, the fatigue life issues are also taken into account,which mainly reflects in the legs of the platform under random wave loads.The static strength analysis in combination with fatigue studies can be used to assess thefatigue characteristics of the jack-up platform leg. So, at first, the static strength of the wholestructure under both towing and in-place conditions were studied, and on this basis, thefatigue life analysis of the leg was carried out under wave loads during the in-placeconditions.The contours of fatigue life and safety factor can be obtained after cyclic loadings. Themain contents can be stated as follows:1.An analytical method to determine the structural strength and fatigue life of suchoffshore platform was introduced, the development of the analytical process as well as themain points and strength specification were determined.2.The analysis theory and methods of calculation on wind loads, wave loads and fatiguebehavior were briefly illustrated in this part. In addition, a finite element model of theplatform is established, several key issues in structural static strength calculation were studied,and finally the structural strength of the whole model and each part are checked including ofthe stress and its distribution of the platform.3.A fatigue model of the jack-up offshore platform was built by FE-SAFE which iswidely used in structural fatigue simulations. The fatigue life and safety factor of the leg onplatform in the depth of100meters,107meters and122meters are obtained separately. |
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