船舶衝突時の浮遊式海洋構造物に作用する衝突力と係留力の変動

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It is very important to investigate the phenomena of ship collisions with offshore structures not only from viewpoint of safety but also for the purpose of designing the effective buffer equipments to protect offshore structures.There are a number of reports on the ship collisions with nuclear powered ships or oil tankers. The collisions between ships and offshore structures have been mainly studied for fixed type structures. This report describes the impact force and the increase of mooring force of structure when a ship collide with a moored floating offshore structure. In the analysis of the equations of motion on the ship collisions, the whole hydrodynamic forces on the striking ship and the struck structure were converted into equivalent added mass, because inertia force dominates the phenomena of ship collisions in comparison with other forces.The experiments were carried out using a box type structure model which was about six times in weight as striking ship model. The structure model was moored by the three different kinds of mooring types. They were spring mooring, taut mooring and slack mooring. The forms of external force in ship collision, which showed the relations between penetration of striking ships and impact force, were approximated with linear coil spring of the buffer model equiped on the front of structure model.Based on the experimental results, the calculation methods of mooring force for the three kinds of mooring types and the added mass coefficients of box type floating structure were established.
独立行政法人海上技術安全研究所の論文
1982-11-30

船舶衝突時の浮遊式海洋構造物に作用する衝突力と係留力の変動

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