A Study on the Hull Girder Torsional Strength Assessment of Container Ship Structures

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Container ships having large hatch openings are subject to large torsional response, and therefore, torsional strength assessment is important when designing the container ship structures. In this paper, a practical method for conducting torsional strength assessments of container ship structures with transparent and consistent backgrounds is described. First, in order to estimate the torsional response characteristics as accurately as possible, the three-dimensional Rankine source method is employed to estimate the wave loads on a container ship, and then FE analyses are conducted on an entire-ship model based on the estimated loads. Using these results, a dominant regular wave condition is specified under which the torsional response of the container ship is maximized. Design loads for torsional strength assessment that give a torsional response equivalent to the long-term predicted values for torsional response are investigated based on the calculated results under the specified dominant wave condition. An appropriate combination of stress components to estimate the total hull girder stress is also discussed
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