中文摘要：

提出一种复合载荷下T型管节点应力集中系数（SCF）数值计算方法，并就SCF海冰参数影响进行研究．鉴于采用位移边界条件对管节点应力分析不能充分体现管节点交界处应力集中情况，选用载荷边界条件法计算管节点SCF；借助于ANSYS软件子模型技术，实现在模型中同时施加轴力、面内弯矩和面外弯矩三种基本载荷，采用外推插值法分析复合载荷下管节点交界处应力分布，直接计算出SCF．最后利用该方法研究三个海冰参数：冰厚、来冰方向和冰速对SCF的影响规律，为不同工况下平台冰激疲劳评估选择合适的SCF提供理论依据，具有十分重要的工程应用价值．

英文摘要：

A computational method of stress concentration factors （SCF） in tubular T-joints under combined loadings was proposed, and the SCF change rules with ice parameters were investigated. Since it couldn＇t present the state of stress concentration very well if the displacements were used as the boundary conditions, the load boundary conditions were selected to analyze the stress of the tubular K-joints. Three different types of basic loadings,i, e. axial loading, in-plane and out-of-plane bending were applied to the tubular joints simultaneously by virtue of the submodeling technique in ANSYS system. Then the stress distribution around the connection was obtained according to extrapolation, and the SCF under combined loadings was calculated directly. Finally, the influence rules of SCF distribution and scalar based on ice thickness, ice drift direction and ice velocity were studied through this method. The investigation provides the theoretical basis for determining SCF in tubular T-joints when evaluating the ice-induced fatigue, and has very important engineering application value.