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Geometrical effects on the degree of bending (DoB) of multi-planar tubular KK-joints in jacket substructure of offshore wind turbines
Applied Ocean Research ( IF 4.3 ) Pub Date : 2021-05-05 , DOI: 10.1016/j.apor.2021.102678
Hamid Ahmadi , Adel Alizadeh Atalo

The degree of bending (DoB) characterizes the member through-the-thickness stress distribution which has a profound effect on the fatigue behavior of tubular joints commonly found in steel offshore structures and the determination of DoB values is essential for improving the accuracy of fatigue life estimation. Multi-planar joints are an intrinsic feature of offshore tubular structures and the multi-planarity might have a considerable effect on the DoB values at the brace-to-chord intersection. Nevertheless, for multi-planar joints which cover the majority of practical applications, much fewer investigations have been reported on the DoB due to the complexity and high cost involved. In the present research, data extracted from the stress analysis of 243 finite element (FE) models, verified based on available parametric equations, was used to study the effects of geometrical parameters on the DoB values in multi-planar tubular KK-joints which are among the most common joint types in jacket substructure of offshore wind turbines (OWTs). Parametric FE study was followed by a set of nonlinear regression analyses to develop three new DoB parametric equations for the fatigue analysis and design of axially loaded multi-planar KK-joints.



中文翻译:

几何形状对海上风力涡轮机护套下部结构中多平面管状KK接头弯曲度(DoB)的影响

弯曲程度(DoB)表征了构件的整个厚度应力分布,该分布对海上钢结构中常见的管状接头的疲劳行为产生了深远的影响,DoB值的确定对于提高疲劳寿命的准确性至关重要估计。多平面节理是海上管状结构的固有特征,多平面节律可能对支撑到弦交点处的DoB值产生相当大的影响。然而,对于涵盖大多数实际应用的多平面接头,由于涉及的复杂性和高昂的成本,有关DoB的研究报道很少。在本研究中,从243个有限元(FE)模型的应力分析中提取的数据已根据可用的参数方程进行了验证,用于研究几何参数对多平面管状KK接头中DoB值的影响,这些接头是海上风力涡轮机(OWT)外套下部结构中最常见的接头类型之一。参数有限元分析之后,进行了一组非线性回归分析,以开发三个新的DoB参数方程,用于疲劳分析和轴向载荷多平面KK接头的设计。

更新日期:2021-05-06
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