This paper examines the structural behavior of a steel catenary riser (SCR) with a segment composed of a functionally graded material (FGM) at the touchdown zone (TDZ). A co-rotational beam formulation is employed to evaluate the influence of material gradation on the static and dynamic nonlinear behavior of the riser. A finite element model is developed to predict the riser response considering environmental and operational conditions such as self-weight, buoyancy, current, soil contact, waves, buoys, and ship motion. Moreover, a comparison of SCR configurations is made between those constructed from FGM and those constructed from standard homogeneous materials. The study indicates that an SCR configuration with an incorporated FGM segment improves the curvatures near the TDZ, where designing to mitigate fatigue damage is critical.

本文研究了在接触区（TDZ）处有功能梯度材料（FGM）组成的链段的钢悬链立管（SCR）的结构行为。采用同向旋转梁公式来评估材料渐变对立管的静态和动态非线性行为的影响。考虑到环境和操作条件（例如自重，浮力，水流，土壤接触，波浪，浮标和船舶运动），开发了有限元模型来预测立管响应。而且，在由FGM构造的构造和由标准均质材料构造的构造之间进行了SCR构造的比较。研究表明，结合了FGM片段的SCR配置可改善TDZ附近的曲率，在该设计中减轻疲劳损伤至关重要。