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Loading Uncertainties in Extreme Waves

by Arnt Olufsen, SINTEF, Norway,
Robert G. Bea, SINTEF, Norway,



Document Type: Proceeding Paper

Part of: Structural Safety and Reliability

Abstract:

Uncertainties associated with extreme base shear forces and extreme overturning moments are estimated for an idealized eight-legged jacket platform. The structure is assumed to respond statically, and wave forces due to the drag term in the Morison's equation are considered. Cumulative distribution functions of the extreme response are estimated based on first order reliability methods (FORM). The FORM analysis includes uncertainties from wave heights, bias due to hindcast wave data, marine growth and wave force calculations (i.e., method of response analysis, wave force model, wave kinematic theory, wave directionality, roughness of cylinders and shielding, the latters which effects the drag coefficient).

Subject Headings: Load and resistance factor design | Wave forces | Water waves | Dynamic structural analysis | Uncertainty principles | Structural reliability | Offshore structures

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