STUDIES ON RELIABILITY ANALYSIS SYSTEMS OF SHIP HULL STURCTURES

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This study is concerned with structural reliability analysis systems of ship hull structures. Results obtained in this study are summarized as follows :1. Reliability analysis for compressive strengths of stiffened panels under longitudinal bending stress and lateral pressure is performed at various parts of the hull girder. The results for various strength equations are compared from a viewpoint of reliability. Effects of some design parameter sensitivity analysis for the reliability index.2. The features of structural reliability of a large bulk carrier (150,000DWT) based on the collapse mode analysis are investigated by successively applying the newly developed system for plate structures using a spatial membrane element model in the previous studies.3. From the analytical results, effects of shearing stress and lateral pressure on dominant collapse modes including damages of side shell elements and their occurrence probabilities in the fore/aft L/4 parts of the ship hull structure are more remarkable than in the midship part.4. It is also pointed out that anothert results for deteiorated stuctures considering the notional corrosion damage referred to the classNK report report are in comparatively good correspondence to the features of structural damages due to corosion at fore/aft parts of aged bulk carriers.5. A new system for combined frameworks and plate structures is considered to offer the expansion of applicability of structural system reliability of marine structures.6. A method using varying load simulation techniques is also developed for fatigue reliability analysis of marine space structures under nonlinear and irregular wave induced loads.