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首页> 外文期刊>Ocean Engineering >A probability distribution model for SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to out-of-plane bending loads
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A probability distribution model for SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to out-of-plane bending loads

机译：平面外弯曲载荷作用下海洋结构内环加筋管状KT节点中SCF的概率分布模型

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The stress concentration factor (SCF) is one of the principal inputs in the fatigue reliability analysis of tubular joints. The SCF shows substantial scatter that highlights the necessity of deriving its governing probability function accurately. In the present research, results from 432 finite element (FE) stress analyses, verified against experimental data, were used to develop a probability distribution model for the SCF5 in tubular KT-joints reinforced with internal ring stiffeners subjected to four types of out-of-plane bending (OPB) loads. Based on a FE parametric investigation, a sample database was prepared for the maximum chord-side SCFs of central and outer braces; and density histograms were generated for these samples. Nine different probability density functions (PDFs) were fitted to these histograms. The maximum likelihood method was used to determine the parameters of fitted distributions. In each case, using a developed computer code, Kolmogorov-Smirnov test was applied to assess the goodness of fit. Finally, the Generalized Extreme Value model was selected as the best-fitted distribution and after substituting the values of estimated parameters, six fully defined PDFs were proposed for the maximum chord-side SCFs of central and outer braces in internally ring-stiffened tubular la joints subjected to four types of OPB loading. (C) 2016 Elsevier Ltd. All rights reserved.
机译：应力集中系数（SCF）是管状接头疲劳可靠性分析的主要输入之一。 SCF表现出很大的分散性，突出了准确推导其支配概率函数的必要性。在本研究中，通过432有限元（FE）应力分析的结果（已通过实验数据验证）被用于开发SCF5在承受四种类型外应力的带内环加劲肋的管状KT节点中的SCF5概率分布模型。平面弯曲（OPB）载荷。基于有限元参数研究，准备了一个样本数据库，用于获取中括号和外括号的最大弦侧SCF。并为这些样品生成密度直方图。这些直方图拟合了九种不同的概率密度函数（PDF）。用最大似然法确定拟合分布的参数。在每种情况下，使用开发的计算机代码，均使用Kolmogorov-Smirnov测试来评估拟合优度。最后，选择广义极值模型作为最合适的分布，并在替换估计参数的值之后，提出了六个完整定义的PDF，以对内环加筋的管状La关节的中央和外部支撑的最大弦侧SCF进行建议。承受四种类型的OPB加载。 （C）2016 Elsevier Ltd.保留所有权利。

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