KK型管节点应力集中系数几何敏感性分析

KK型管节点是自升式平台桁架式桩腿中的一种管节点，其应力集中系数是影响桩腿疲劳寿命的重要参数。应力集中系数与管节点的几何形式密切相关，为分析KK型管节点应力集中系数对几何参数的敏感性，利用ANSYS软件对某KK型管节点进行几何参数化建模，利用有限元数值模拟方法对各工况下的热点应力进行分析，并分别计算各相应工况下的名义应力，然后将热点应力与名义应力相比得到不同几何参数下的热点应力集中系数。对计算结果进行整理分析，得到了KK型管节点应力集中系数对无量纲几何参数的敏感性规律。结果表明，应力集中系数与撑杆受力状态、管节点结构形式有关，在满足结构布置、建造工艺和其他安全性指标的前提下，分析结果能够为KK型管节点的结构设计和疲劳分析提供技术支撑。

Geometric sensitivity analysis of stress concentration factor of KK-type tube joints

KK tubular joint is a kind of tubular joint in the truss leg of jack-up platform, and its stress concentration factor(SCF) is an important parameter affecting the fatigue life of the leg. SCF is closely related to the geometric form of tubular joints. In order to analyze the sensitivity of SCF to geometric parameters of KK tubular joints, ANSYS is used to build a geometric parametric model of a KK tubular joint, and FEM method is used to analyze the hot spot stress under various working conditions. The nominal stresses under different working conditions are calculated separately, and are compared with the hot spot stresses to obtain the SCFs under different geometric parameters. The sensitivity of SCF of KK tubular joint to dimensionless geometric parameters is obtained by sorting out and analyzing the calculation results. The results show that the SCF is related to the loading state and the structural form of tubular joint. On the premise of satisfying the structural layout, construction technology and other safety indicators, the analysis results can provide technical guidance for the structural design and fatigue analysis of KK tubular joints.