A great deal of existing jacket platforms need to be assessed in order to determine whether they can be reused or not. In allusion to the differences between the existing service platforms and the drafting ones, a methodology of system reliability-based assessment of existing jacket platform is presented and is applied for the assessments of BZ28-1 three jacket platforms which have operated for sixteen years. In terms of nonlinear mechanical analysis, correcting the statistical parameters of the sea states and considering pile-soil-structure nonlinear interaction, the mechanics characteristics of three jacket platforms subjected to extreme loads were analyzed. Based on the FEM model, with Monte Carlo simulation, the reliability of the platforms was studied. From the practical application, the method can be used to estimate the service life of the existing platforms and ensure their secure operation.

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