应用分区产生网格的方法产生了K型节点的有限元模型,计算了在轴向荷载作用下K型节点焊缝周围的热点应力分布情况,并与相关试验结果进行对比分析,验证了所提出的有限元模型的可行性和准确性.通过对1 152个K节点模型分析,研究了几何参数对K型节点焊缝周围热点应力分布的影响,发现在几何参数取不同值时热点应力的分布随几何参数的变化发生改变,而且热点应力的位置也随着几何参数的变化在冠点和鞍点之间移动.并在此几何参数分析的基础上,提出了K型节点焊缝周围应力集中系数分布的参数公式,并对参数公式进行了误差分析.对于绝大多数K节点模型,拟合得到的参数公式所计算的焊缝周围应力分布结果是精确可靠的,所以提出的参数公式为工程中K节点疲劳设计和分析提供了参考方法.%The finite element model of tubular K-joint is presented using sub-zone mesh generation method. The distribution of hot spot stress (HSS) along weld toe of a tubular K-joint under axial loads is analyzed,and the results obtained by means of the finite element model were compared with experimental measurements. It is shown that the finite element model proposed in this study is feasible and accurate for estimating the stress distribution of the K-joint.Through the parametric study on 1 152 K-joint models, the effect of geometrical parameters on the distribution of hot spot stress along the weld of tubular K-joints subjected to axial loads is investigated, and it is found that the distribution of hot spot stress is varied with different geometrical parameters values. Furthermore, the position of the hot spot stress shifts between the crown and the saddle when some geometrical parameters are different.Based on the parametric study, parametric equations of stress concentration factor distribution along the weld toe of tubular K-joints under axial loads are proposed,and the error analysis of these parametric equations is also carried out.It is found that the presented equations are feasible and accurate to compute the stress distribution for most analyzed K-joint models. These parametric equations proposed in this study can provide valuable advice for the fatigue design and analysis of K-joints in practice.
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