Abstract
This paper addresses the cumulative collapse behavior of a ship hull girder under a series of extreme wave loads. It is a follow-up of the previous work done by the present authors. In the previous work, the post-ultimate strength behavior under a single extreme wave was investigated by using numerical simulations and tank tests. The reduction in the vertical bending moment after reaching the ultimate strength was not reproduced in the scaled model. In the present work, a more realistic hull girder capacity model is employed. We introduce a new type of model whose hull girder bending moment capacity decreases after its ultimate strength. A series of the focused waves with the same time history are generated and applied to the scaled model in the tank tests. It is observed that the still-water bending moment decreases with the development of the plastic deformations. The development rate of collapse per one focused wave becomes smaller under a series of focused waves if the reduction rate of the still-water bending moment is larger than the reduction rate of the bending moment capacity after the ultimate strength.
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Acknowledgments
The present work was partially supported by KAKENHI, Grant-in-Aid for Challenging Exploratory Research (23656549), 2012.
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Iijima, K., Fujikubo, M. Cumulative collapse of a ship hull girder under a series of extreme wave loads. J Mar Sci Technol 20, 530–541 (2015). https://doi.org/10.1007/s00773-015-0308-3
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DOI: https://doi.org/10.1007/s00773-015-0308-3