柔軟な緩衝工と船舶の接岸力

概要

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The size of ocean-going ships has been growing steadily for these ten years, especially it is remarkable in the case of oil tankers. In a few years ago, a ship of 20,000 tons dead weight was called "Super tanker", but now there are ships of over 150,000 tons dead weight in service. Since existing berthing structures were not designed for such big vessels, the reconsiderations of the design data of bething structures have been quite important for safety-berthings. In the usual case of ship berthing on dolphin, the discriminant of the auxiliary equation for the equation of motion S^^<..>-α{f(t)-S^^.}+kS=0 (c.f. 2.1) is α^2-4k<0. If a large ship hits the existing berthing structure, which is slender in comparison with the ship, the discriminant may be positive. This paper reports the results of some theoretical considerations, model experiments and an "in-situ" experiment in such cases. The velocity and change of velocity of water particles in the vicinity of ship depend on their position and the initial condition, therefore it is shown that the influence of the water-pressure on the hull varies with the load-deflexion characteristic of berthing structure and the berthing velocity.
独立行政法人海上技術安全研究所の論文
1967-06-30