부산대학교 도서관

Mooring fittings mean various devices and fittings to safely fasten vessels to quays, jetties, sea-floating buoys, etc. They include such devices as mooing winches and capstans, such fittings as chocks, fairleads, guide rollers, bollards, and bitts, and the seats and reinforced parts of vessels these fittings are installed. They also include ropes and chains used for mooring and chain stoppers that secure chains to vessels. Because of damages to mooring fittings during mooring directly related to large-scale accidents such as the drifting of vessels, mooring fittings with strength appropriate for the physical features of the vessels must be installed. The reinforcement of the vessels on which the mooring fittings are installed must be designed to withstand the loads transferred from the fittings as well. Also mooring fittings with efficient strength should be required because damaged ships lead to sea pollution such as oil or fuel oil spillage. Mooring fittings are various and are applied differently on the basis of vessel size. The reality for now is that each shipyard in South Korea has different design specification for mooring fittings, and even different standards to apply for same fittings. Most of the fittings items should meet the guidelines of the OCIMF(Oil Companies International Marine Forum). The purpose of study is to suggest the standardization model for strength analysis of the closed chocks by using the Finite Element Method. This study has been performed by the Finite Element Method for two aspects of closed chocks which are divided into structure-supporting shapes and working load. In the case of structure-supporting shapes, they have been performed in the field of sheet and bulwark. As for working load, it has been analyzed according to working load direction such as chock's side and below. At first, strength analysis for unique closed chocks has been carried out by using the Finite Element Method, they are applied for the situation when vessels pass by the panama canal. And then the experiment has been done to verify the analyzed date obtained by FEM. The experimental results were found to be similar to the numerical results with up to 16% difference. On the basis of the results obtained, standardization has been carried out by the Finite Element Method for various sizes of closed chocks.