荒天時港外錨泊の安全性評価モデル

概要

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The present paper proposed a probability model for evaluating the safety level of a ship moored at anchor under stormy weather such as typhoon. It is well known that JIS-type anchor loses its holding power after making rotate the palm round the shank over 45°. Based on the results of model test, the distribution of the maximum dragging distance (Y) until the anchor loses its holding power can be approximated by the normal distribution. Accordingly, the probability that the anchor loses its holding power during the ship is dragging her anchor can be calculated as follows; P_<υf>=∫^X_<-∞>f(Y)dY where, X is the dragging distance within a certain period of time and can be estimated from the relation between the load acting on the anchor and the dragging distance which were derived from the results of model test. Proposed model gives us many information regarding with the safety level of the mooring system, therefore, it is useful for decision making on the engineering planning and design of the mooring system under stormy weather.
社団法人日本航海学会の論文
1986-03-25