水下生产系统跨接管结构在地震作用下动力响应分析

摘要

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 were analyzed. Seismic waves were input into the subsea jumper in both horizontal and vertical directions, nonlinear springs were used to simulate soil- jumper interaction, and hydrodynamic forces due to earthquake were considered. Different models were analyzed and compared. It was shown that vertical earthquake has more magnificent effect on the frequency of the jumper dynamic horizontal response than its effect on the magnitude of the response, the soil- jumper interaction increases the magnitude change of the response and stimulates higher modes, hydrodynamic forces have great influence on the magnitude of the response. In conclusion, the proposed approach provided a reference for subsea jumper design and safety assessment.