Cumulative collapse of a ship hull girder under a series of extreme wave loads
Cumulative collapse of a ship hull girder under a series of extreme wave loads
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DOI：
10.1007/s00773-015-0308-3
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发表时间：
2015-02
影响因子：
2.6
通讯作者：
K. Iijima;M. Fujikubo
中科院分区：
文献类型：
--
作者：
K. Iijima;M. Fujikubo
本文研究了船体梁在一系列极端波浪荷载作用下的累积破坏行为。这是现任作者先前工作的后续工作。在之前的工作中，通过数值模拟和槽内试验研究了单次极端波作用下的极限后强度行为。在达到极限强度后，竖向弯矩的减小没有在比例模型中重现。在本工作中，采用了更为实际的船体梁承载力模型。本文介绍了一种新型船体梁弯矩承载力在达到极限强度后减小的模型。产生一系列具有相同时程的聚焦波，并将其应用于水罐试验的比例模型。静水弯矩随塑性变形的发展而减小。当静水弯矩折减率大于极限强度后弯矩容量折减率时，在一系列聚焦波作用下，单个聚焦波的崩塌发展速率变小。
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.