Fatigue Analysis of Steel Catenary Risers Based on a Plasticity Model  

作　　者：Yongqiang Dong Liping Sun 

机构地区：[1]College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

出　　处：《Journal of Marine Science and Application》2015年第1期76-82,共7页船舶与海洋工程学报（英文版）

基　　金：Supported by the 111 Project(Grant No.B07019)

摘　　要：The most critical issue in the steel catenary riser design is to evaluate the fatigue damage in the touchdown zone accurately. Appropriate modeling of the riser-soil resistance in the touchdown zone can lead to significant cost reduction by optimizing design. This paper presents a plasticity model that can be applied to numerically simulate riser-soil interaction and evaluate dynamic responses and the fatigue damage of a steel catenary riser in the touchdown zone. Utilizing the model, numerous riser-soil elements are attached to the steel catenary riser finite elements, in which each simulates local foundation restraint along the riser touchdown zone. The riser-soil interaction plasticity model accounts for the behavior within an allowable combined loading surface. The model will be represented in this paper, allowing simple numerical implementation. More importantly, it can be incorporated within the structural analysis of a steel catenary riser with the finite element method. The applicability of the model is interpreted theoretically and the results are shown through application to an offshore 8.625 steel catenary riser example. The fatigue analysis results of the liner elastic riser-soil model are also shown. According to the comparison results of the two models, the fatigue life analysis results of the plasticity framework are reasonable and the horizontal effects of the riser-soil interaction can be included.

关 键 词：steel catenary riser fatigue analysis riser-soil interaction plasticity model finite element method 

分 类 号：O346.2[理学—固体力学] TU441.4[理学—力学]