深海钢悬链立管触地点动力响应分析

Dynamic response analysis of a deepwater steel catenary riser at the touchdown point

研究深海钢悬链立管(SCR)在海洋环境载荷作用下的动力响应。利用非线性弹簧模拟立管与海床触地点的耦合模型,通过模态分析得到钢悬链立管的动力特性参数;时域动力响应分析获得不同工况下触地点及典型部位的位移、弯矩和应力时程。比较分析表明:浮体垂荡运动对触地点的应力状态影响较大,触地点附近存在钢悬链立管动力响应过程中的位移极值点和弯矩极值点。所提方法为触地点区域模拟分析提供了新思路,给出的分析结论对钢悬链立管设计有一定借鉴意义。

This paper presents dynamic response of a deepwater steel catenary riser （SCR） under anlbient excitations. The nonlinear spring is used to simulate the soil-riser interaction in the touchdown point （TDP）. The SCR＇s dynamic characteristic parameters have been obtained by modal analysis. Dynamic response features of the SCR in different operation conditions have been acquired by transient analysis. According to the comparative analysis, it shows that the vessel heave greatly affects the stress of touchdown point, extreme value of displacement and bend- ing moment occurs near the touchdown zone. In conclusion, the proposed approach provides a new strategy to simulate the TDP and the research results are helpful to the SCR＇s design.