oa Civil Engineer in South Africa - Detailed fatigue design of the structural jacket
The design of the Mossgas FA jacket for fatigue due to the aggressive wave conditions found off the Mossel Bay coast proved to be one of the most complex of all the structural analyses. This paper describes the selection of the fatigue wave loadings and the manner in which they were applied to the structure in order to assess the resulting stress ranges throughout the jacket. The effect of dynamic behaviour of the structure as well as local stress concentrations are considered and the method of assessing the fatigue life at any position on the structure is described. The paper concludes that the use of the most up to date technology for this project has resulted in a fatigue-efficient structure that will be safe for the 30-year life of the platform.
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