ABSTRACT
The background formulation to predict ship design load provided by Classification Society rules is derived based on long-term sea-state data of the North Atlantic Ocean. This load may apply to ships sailing worldwide, but it may be conservative when used for designing the ships sailing in closed sea such as Indonesia. Therefore, a more proportional wave-induced load needs to be defined. To support this study, 35 years wave observation data has been collected to compose a scatter diagram of the Indonesian waterway. By these data, the local wave load parameter has been determined based on the 10-8 probability exceedance level. The linear long-term analysis is performed on around 100 merchant ship models that are derived from 10 hull forms within the length of 50 m to 350 m. The results show that all ship model operated in Indonesia gives 70% lower wave induce bending moment compared to North Atlantic.
