Nonlinear wave load effects on the stochastic behavior of fixed offshore platforms.
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A two dimensional multiple mode stochastic formulation, which accounts for the relative motion between the fluid and the structure and addresses the nonlinear wave loading effects were developed. Four similar fixed offshore platforms designed for water depths ranging between 400 feet (122 m) and 1000 feet (328 m) were used to illustrate the methodology. The importance of considering both the wave structure interaction and a third order approximation for the nonlinear wave loading effects are discussed. The role of hydrodynamic damping as compared with the usual viscous damping approximations is also discussed. The numerical results consistently demonstrate that each of these factors plays a significant role when predicting the response of fixed offshore platforms in water depths in excess of 400 feet (122 m). (A)