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Collapse Behaviour of a Bulk Carrier under Alternate Heavy Loading Conditions

机译:交替重载条件下散货船的坍塌行为

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For a bulk carrier in alternate heavy loading conditions, it is noted that the double bottom of an empty hold is subjected to both longitudinal thrust due to hull girder bending in hogging and local bending caused by high pressure loads on bottom plating. In order to examine the influence of local bending of the double bottom on the ultimate hull girder strength, a series of nonlinear calculations is performed applying three different methods. The first method is Smith's method using in-house code, HULLST, to evaluate ultimate hull girder strength under pure bending. The second is the application of a new system recently developed by the authors. This method is a combination of load/motion analysis by Singularity Distribution Method and progressive collapse analysis by ISUM/FEM. The third is nonlinear FEM analysis using a commercial code, MSC.Marc. It has been found that bending deformation is produced not only in the double bottom but also in the bilge hopper tank, and the ultimate hull girder strength is reduced by roughly 20% due to this local bending.
机译:对于交替重载条件下的散装货船,应注意的是,空舱的双层底部既承受因船体弯曲引起的船体纵梁的纵向推力,又承受由于底板上的高压载荷引起的局部弯曲。为了检查双层底的局部弯曲对最终船体梁强度的影响,采用三种不同的方法进行了一系列非线性计算。第一种方法是使用内部代码HULLST的Smith方法来评估纯弯曲时的最终船体梁强度。第二个是作者最近开发的新系统的应用。该方法结合了奇异分布法的载荷/运动分析和ISUM / FEM的渐进倒塌分析。第三个是使用商业代码MSC.Marc进行的非线性有限元分析。已经发现,不仅在双层底部而且在舱底料斗中都产生弯曲变形,并且由于这种局部弯曲,最终船体梁强度降低了约20%。

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