水下生产系统跨接管结构极限承载能力分析  

Ultimate strength analysis of a jumper in subsea production facility

作　　者：马增骥[1] 唐文勇[1] 薛鸿祥[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240

出　　处：《海洋工程》2013年第1期9-15,共7页The Ocean Engineering

摘　　要：跨接管是水下生产系统的主要构件之一,水下地形变化易导致跨接管两端承受较大边界位移载荷,对水下生产系统的结构安全性产生不利影响。研究并分析了端部相对位移载荷作用下跨接管结构的极限承载能力及跨接管失效模式的特点,表明整体轴向压缩位移分量是导致跨接管结构发生极限破坏的主要因素。在此基础上考虑了内表面周向裂纹对跨接管极限强度的影响。分析结果表明:当裂纹较小时,因弯管截面的椭圆化和塑性屈服,轴向压缩位移很容易使跨接管发生整体压缩失效;当裂纹较大时,因为裂纹韧带区的高应力效应,跨接管会在整体压缩失效之前达到极限状态;最终失效模式取决于裂纹的位置及大小。Jumper is one of the most important components of subsea production system,and its two ends are easily subject to primary displacement loading caused by variable underwater topography,thus will have negative effects on the structural safety of subsea production system.Analysis of the ultimate bearing capacity of jumper structure with end relative displacement and study of the characteristics of failure modes of jumpers are made,which indicate that the component of axial compressed displacement is the major factor that causes ultimate failure to jumper structure.Considering the influence of circumferential crack in inner surface on the ultimate strength of jumper,the analysis result indicates： when crack is small,because of the ovalling of pipe section and plastic yielding,axial compressed displacement will make the jumper structure be processed to the state of plastic instability easily.When crack is large,because of the high stress effect of the crack ligament area,the jumper structure will progress into ultimate condition before the state of plastic instability.The final failure mode depends on the location,length and depth of crack.This work provides useful information to design and safety assessment of jumper structure.

关 键 词：水下生产系统 跨接管 极限承载能力 失效模式 周向裂纹 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]