Abstract
It is necessary to study on safety of the refugee of from viewpoint of port planning, too. Recently, breakage casualties of stranded ships become very serious in port operation and coastal environment. However, these problems have not been discussed among coastal engineering and shipbuilding, neither. In this study, we summarize importance of this point by showing statistic of casualties. Then, strength of ship hulls is caluclated with strip method and basic dynamics of material, when ships are designed to navigate in ocean. Since calculated results cannot explain breakage casualties, possibility of enlarged stress due to crack is also considered as a simple example. The results can explain that breakage of stranded ships may be caused by enlarged stress due to cracks on ship hull. Therefore, safety of coastal areas outside harbour should be considered totally with anchored ship motions and fracture mechanics of ships in detail in future.
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