深海立管碰撞引起的局部损伤分析  

Analysis of local damage caused by deep-sea risers collision

作　　者：仇思棋 李效民[1] 郭海燕[1] QIU Siqi;LI Xiaomin;GUO Haiyan(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海洋湖沼通报》2024年第1期53-61,共9页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金(51979257);山东省自然科学基金(ZR2019MEE032,ZR2020ME261)。

摘　　要：采用LS-DYNA软件,用ALE方法建立了相邻串列立管与水体环境的流固耦合模型,对深海立管碰撞引起的局部损伤进行分析。首先对模型的正确性进行验证,并分析了不同边界条件下碰撞结果的差异。随后对不同速度、角度和轴向拉力下立管碰撞产生的有效应力和凹陷损伤进行时程分析。结果表明,流体对立管间的碰撞有一定的缓冲作用,耦合状态下管道间碰撞产生的有效应力和凹陷损伤情况小于非耦合状态下的结果;在低速小角度的情况下,角度的变化引起的立管间碰撞产生的损伤情况比因速度变化引起的结果更加明显;轴向拉力对立管凹陷损伤影响很小,且存在一段有效应力与轴向拉力呈负相关的区域。In order to research the influence of deep-sea risers' local damage caused by collision,the fluid structure interaction(FSI) model with the methods of ALE by the finite element software LS-DYNA was built.The accuracy of model was verified.At the same time the differences of the results of colliding damage with the varied boundary conditions was considered.Then the time history analysis of effective stress and dent damage on account of risers collision with distinct velocities,angles and axial tension were also considered.The results showed that the fluid had a degree of buffering effect on the collision,and the value of effective stress and dent damage caused by colliding in the condition of coupling were less than non-coupling value.In the case of low speed and small angle,the damage of risers collision influenced by the change of angle was more obvious than that influenced by the change of speed.The axial force had little influence for dent damage,and there was a region where had a negative correlation between effective stress and axial tension.

关 键 词：深海立管 流固耦合 局部碰撞 有限元分析 

分 类 号：TU311.3[建筑科学—结构工程]