Modeling wave loads on ships using peaks over threshold method

Statistical analysis of wave loads on ships is important in establishing the wave load design criteria. This paper applies the peaks-over-threshold method in studying the statistics of the wave-induced bending moments in ships of various types under various loading conditions. The generalized Pareto distribution (GPD) are used for representing the wave load peak values exceeding a high threshold level. The selection of threshold and estimation of GPD shape parameter and extreme values are discussed. The study reveals that the distributions of the wave-induced bending moments are super-exponential for all ship types. The estimated extreme values based on GPD agree well with those based on Weibull distribution.