EVALUATION OF CONTAINER CENTER OF GRAVITY HEIGHT INFLUENCE ON DECK CONTAINER STACK LOADS

The loads acting on the deck container stack, which are one of the most important factors for ensuring the safe containers transportation, are considered. It is noted that at present, the assigned standard values of the container center of gravity height are used to calculate the deck container stacks lashing arrangement. It is expressed in the fact that the programs used for calculating the loads acting on container stacks take into account a single value of container center of gravity height, without taking into account the actual values for each individual container. The purpose of this study is a comparative evaluation of the effect of the standard and actual container center of gravity height on the loads acting on the deck container stack. For this purpose, the methods of calculating loads on container stacks according to the rules of classification societies are analyzed. The relationships between all the factors used to calculate the loads are revealed. Experimental calculations of loads on deck container stacks of different configurations and taking into account different initial data that may be encountered in practice are performed. As a result, it was confirmed that the container center of gravity height has a significant influence on the values of the forces that form the loads on deck container stack. It is concluded that the combined effect of the actual metacentric height and the actual container center of gravity height can lead to both an increase and a decrease in the loads acting on the deck container stack. The necessity to take into account the values of the actual container center of gravity height when calculating the stability and lashing arrangement of deck container stacks is justified. A recommendation to take into account the actual center of gravity height of each container in specialized programs for calculating container lashing arrangement on the ship is proposed.

container ship, container, center of gravity, stability, metacentric height, container stack, load

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