Analysis of wave load combination including slamming

Abstract

Analysis of wave load combination including slamming

It is necessary to estimate extreme sea loads when probabilistic and reliability methods are used to analyse t~e ultimate strength of ship corresponding to the modes of failure due to yielding or inelastic buckling. The ship response records taken in full-scale tests show that the vertical stress time his tory consists of a rapidly varying time history with random amplitude and frequency, oscillating about a mean value. The mean value itself is a weakly timedependent function. The rapidly varying part includes a low frequency component due to the motion of ship as a rigid body, and a high frequency one due to the impact of the ship as a flexible body on the water, Le. slamming ("springing" of the flexible ship excited by the energy present in the high frequency wave components is not considered in this paper).