Response Surface Fitting in Offshore Structural Design

by G. Chiesa, Snamprogetti SpA, Italy,
J. van Dyck, Snamprogetti SpA, Italy,
F. Zuccarelli, Snamprogetti SpA, Italy,

Abstract: Failure probability estimation of complex offshore structures requires the modeling of the system behavior in terms of all uncertain parameters. This paper investigates the applicability of response surface methods for the modeling of wave loads on an offshore platform as a function of various sea-state variables, and of the platform foundation stiffness as a function of soil parameters and loads. For each of the two applications, selection of the fixed and random effects, experimental design, fitting of the response surface and evaluation of fitting and random error is discussed.

Subject Headings: Offshore structures | Surface waves | Load factors | Stiffening | Probability | Parameters (statistics)

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