Abstract
A single-degree of freedom system model of a fixed offshore platform is subjected to hydrodynamic forces. Solutions are obtained using three different forms of representing the drag forces: non-linear and coupled to the structure responses; non-linear and uncoupled; and the standard linearized form. For a harmonic sea state, a solution of the non-linear coupled case was obtained through a step-by-step integration procedure. Solution of the non-linear uncoupled case was obtained by decomposing the drag forces into harmonics and then using superposition to obtain total response. Solution of the linearized case was obtained in the normal way which included iterations in the solution to arrive at a consistent linearized model of the drag forces. Response time histories were also obtained for a simulated random sea state. From these, response statistics were computed and tests were performed on the sample extreme values to determine their fitness to the Gumbel Type I probability distribution.
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