水下生产系统跨接管结构在地震作用下动力响应分析

研究水下生产系统跨接管结构在地震波载荷下的动力响应特性。分析中计及了地震波沿水平和竖向两个方向的载荷输入，采用非线性弹簧模型模拟跨接管与海床的耦合作用，同时考虑了地震作用下跨接管的动水作用效应。通过对不同影响因素下结构的动力响应结果分析表明：竖向地震波对跨接管结构水平响应幅值影响较小，但显著改变其响应频率；管土接触引起跨接管响应幅值变化明显，并激发跨接管高阶振型；地震下动水作用力对跨接管的响应幅值影响较大。所建立的分析方法对跨接管结构设计和安全性评估有一定借鉴意义。

Dynamic responses of a jumper in a subsea production facility under earthquake

Dynamic responses of a jumper in subsea production facility under earthquake are analyzed. Seismic waves are input into subsea jumper in both horizontal and vertical direction, the nonlinear springs are used to simulate the soil- jumper interaction, and hydrodynamic forces due to earthquake are considered. Different models are analyzed and compared. It shows that vertical earthquake has more magnificent effect on the horizontal frequency of jumper dynamic response than the magnitude, the soil- jumper interaction increases the magnitude and stimulates higher modals, hydrodynamic forces have great influence on magnitude. In conclusion, the proposed approach provides strategy to the subsea jumper design and safety assessment.