Inundation effect of wave forces on jack-up platforms

Abstract

A concentrated force acting on the platform at the mean water level is used to represent the inundation effect of the variable wave surface. Its effects on the total and the maximum wave forces are investigated based on structural modal analysis and linear wave considerations. The second-order transfer function of the Volterra/Wiener representation for the nonlinear wave force, with the inundation effect included, is derived. The power spectral density functions of the responses of two typical jack-up platforms are evaluated numerically to show the significant contribution of the inundation effect on the dynamic responses of the structures.