Collapse Behaviour of a Bulk Carrier under Alternate Heavy Loading Conditions
Collapse Behaviour of a Bulk Carrier under Alternate Heavy Loading Conditions
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发表时间：
2013-09
影响因子：
0.8
通讯作者：
Zhiyong Pei;K. Iijima;M. Fujikubo;Yoshiteru Tanaka;Satoyuki Tanaka;S. Okazawa;T. Yao
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作者：
Zhiyong Pei;K. Iijima;M. Fujikubo;Yoshiteru Tanaka;Satoyuki Tanaka;S. Okazawa;T. Yao
对于处于交替重载条件下的散货船，注意到空舱的双层底受到由于中拱时的船体梁弯曲引起的纵向推力和由作用在底板上的高压载荷引起的局部弯曲。为了考察双层底局部弯曲对船体梁极限强度的影响，采用三种不同的方法进行了一系列的非线性计算。第一种方法是史密斯的方法，使用内部代码，HULLST，以评估在纯弯曲下的极限船体梁强度。第二个是作者最近开发的一个新系统的应用。该方法结合了奇异分布法的荷载/运动分析和ISUM/FEM的连续倒塌分析。第三是非线性有限元分析，使用商业代码，MSC。结果表明，不仅双层底发生弯曲变形，舱底也发生弯曲变形，这种局部弯曲使船体梁的极限强度降低约20%。
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.