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对3种不同轴向加载条件下三维直角管式KT型节点的应力集中系数(SCF)进行了一系列参数分析。三维KT型节点是六腿海上导管架结构的一种重要的节点形式,用于连接支撑构件和导管架的主支架。分析结果用于描述几何特性和加载条件对主(外)支架不同位置处SCF的影响。基于经试验数据验证的有限元分析结果,研发出一套完整的SCF数据库;然后经过非线性回归分析,建立了新的SCF方程,用于3种不同加载条件下三维KT型节点疲劳设计。英国能源部(DoE)利用试验数据对这些方程进行了评估,并给出其适用范围。
A series of parametric analyzes of stress concentration factor (SCF) for three-dimensional right-angled tubular KT joints under three different axial loading conditions were carried out. Three-dimensional KT-type nodes are an important form of node for a six-leg offshore jacket structure used to connect the support members and the main bracket of the jacket. The results of the analysis are used to describe the effect of geometry and loading conditions on the SCF at different locations of the main (outer) stent. Based on the results of finite element analysis verified by experimental data, a complete set of SCF database was developed. After that, a new SCF equation was established for the fatigue design of three-dimensional KT nodes under three different loading conditions through nonlinear regression analysis. The British Department of Energy (DoE) used experimental data to evaluate these equations and gave their scope.