ON THE SAFETY OF NAVIGATIONAL WATERWAYS PASSING THROUGH BRIDGE BASED ON THE ANALYSIS OF SHIP COLLISION ACCIDENT

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Recently, owing to the increase of marine traffic and the number of bridges in navigable waters, ship collision accidents with bridges have been increasing. The accidents of the Tasman Bridge of Australia in1975 and the Sunshine Skyway Bridge of U.S.A. in 1980 were brought about by ship collision. In Japan, it is also an important issue to keep the safety of bridges against ship collision, because Honshu-Shikoku Connecting Bridge ( Seto Bridge ) was opened in 1988 and Tokyo Bay Crossing Bridge-Tunnel ( Trans Tokyo Bay Highway ) is being constructed now. In this research, at the first part case of ship collision accidents have been collected and analysed. From this analysis the effects of wind, current and the waterway have been identified as the most significant indirect causes of collision. To further study of these effects, numerical simulations have been executed. As the result of the simulations criteria for ship collisions with bridges have been derived.