During the seventies quite a lot of Jacket offshore platforms have been implanted. They are frame structures made of thousand of steel tubular beam components. Most of them are redundant and have a significant reserve of resistance in spite of local failures such as cracks. The aim of this research task is the analysis of the impact of the through cracks located near welded joints. The idea is to develop physical response surfaces which allow to introduce both random environmental loading and random crack geometry. Probabilistic modeling is based on response surface methodology by mixing the mechanical analysis (Rouhan 1999) and the environmental loading (Schoefs 1996). Global limit state are selected for reliability analysis: evolution of deformation energy and of the displacement of a strategic node. Illustrations on well known offshore platforms typology are selected.
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