海底管道立管系统模拟中的约束处理

Constraint Treatment of Sub-sea Pipeline Raiser System Simulation

在应用有限元法对海底管道立管系统分析时,经常会将立管的顶端模拟成固定端,这种模拟方式在多数情况下是有缺陷的。文章分析了海底管道的实际情况,提出应将立管顶端模拟成弹性支撑的观点,并列举算例进行说明,对立管顶端的约束情况分别采用两种方式模拟,一种模拟成固定端,另一种模拟成弹性支撑。计算结果表明,模拟成固定端的与实际情况不符,而模拟成弹性支撑的比较合理。因此,在进行海底管道设计时,要结合具体情况,采用合适的模拟方式。

Simulating the raiser top end as a fixed end is often adopted in sub- sea pipeline raiser system analysis with finite element method. But in most case s, this simulation method has some shortcomings. This paper analyzes the realit y state of sub-sea pipeline, raises the viewpoint of simulating the raiser top end as an elastic support, and demonstrates the treatment with a calculative ex ample. The results show that this simulation method is reasonable.