SIMPLIFIED COMBINATION OF STILL WATER AND WAVE LOADS WITH THE EMPHASIS IN CONSIDERING A GENERAL WEIBULL CHARACTERISTIC OF WAVE LOADS

摘要

Based on up-crossing rate analysis of the combined still water and wave loads and the first order reliability method, a simplified analytical combination method is developed, by which a general Weillbull characteristic of wave loads can be incorporated in the prediction of extreme values of the combined still water and wave loads acting on ocean-going ships. The results predicted by the developed analytical method agree very well with those by the existing numerical methods. Further, based on type II extreme value distribution and developed load combination method, a probabilistic model for the extreme value of the combined loads is established, which would be very convenient to use in reliability analysis of a ship hull girder. Finally, numerical analysis is carried out to demonstrate the established combination method and probabilistic model.