坠落物撞击作用下海底悬空管道失效分析
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摘要
海底悬空管道受坠落物的撞击会产生机械损伤,对管道安全运行有很大的威胁。为了保证管道的安全运行,对坠落物在海水中的运动状态进行研究,得到坠落物在海水中运动的速度公式。对海底悬空管道受钢质球形坠落物撞击的过程进行数值模拟,研究坠落物质量和管道所处深度对管道损伤的影响。结果表明:当相同质量的钢质球形坠落物撞击海底悬空管道时,管道所处深度小于临界深度时,深度越大管道的等效应变和凹陷深度越大;当不同质量的钢质球形坠落物撞击海底悬空管道时,坠落物质量越大,当相同深度下管道的凹陷深度越大。对管道是否失效进行研究,得到不同判据下管道的失效状态,为工程实际中管道失效分析提供参考依据。
The impact of the dropped objects on the submarine suspension pipeline will cause mechanical damage,which will pose a great threat to the safe operation of the pipeline.In order to ensure the safe operation of the pipeline,the motion state of the dropped objects in seawater is studied,and the velocity formula of the dropped objects in seawater is obtained.The numerical simulation of the impact of steel dropped ball on the submarine suspended pipeline is carried out to study the influence of the quality of the dropped objects and the depth of the pipeline on the pipeline damage.The results show that when the depth of the pipeline is less than the critical depth,the equivalent strain and the deepness of concave on the pipeline increase with the increase of the depth,under the condition that the submarine suspended pipeline is impacted by steel ball with same quality.The deepness of concave on the pipeline at the same depth increases with the increase of the mass of the dropped objects,under the condition that the submarine suspended pipeline is impacted by the steel ball with different quality.The failure state of the pipeline under different criteria based on the analysis of pipeline failure is obtained,which provides a reference for pipeline failure analysis in engineering practice.
The impact of the dropped objects on the submarine suspension pipeline will cause mechanical damage,which will pose a great threat to the safe operation of the pipeline.In order to ensure the safe operation of the pipeline,the motion state of the dropped objects in seawater is studied,and the velocity formula of the dropped objects in seawater is obtained.The numerical simulation of the impact of steel dropped ball on the submarine suspended pipeline is carried out to study the influence of the quality of the dropped objects and the depth of the pipeline on the pipeline damage.The results show that when the depth of the pipeline is less than the critical depth,the equivalent strain and the deepness of concave on the pipeline increase with the increase of the depth,under the condition that the submarine suspended pipeline is impacted by steel ball with same quality.The deepness of concave on the pipeline at the same depth increases with the increase of the mass of the dropped objects,under the condition that the submarine suspended pipeline is impacted by the steel ball with different quality.The failure state of the pipeline under different criteria based on the analysis of pipeline failure is obtained,which provides a reference for pipeline failure analysis in engineering practice.
引文
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[2]DNV.Risk Assessment of Pipeline Protection:DNV GL-RP-F107[S].2017.
[3]ELLINAS C P,WALKER A C.Damage on offshore tubular bracing members[C]//Proceedings IABSE Colloquium on Ship Collision with Bridge and Offshore Structures,1983.
[4]BAI Y,PEDERSEN P T.Elastic-plastic behaviour of offshore steel structures under impact loads[J].International Journal of Impact Engineering,1993,13(01):99-115.
[5]PALMER A,NEILSON A,SIVADASAN S.Impact resistance of pipelines and the loss-of-containment limit state[J].Journal of Pipeline Integrity,2003,2(04):231-240.
[6]PALMER A,TOUHEY M,SI H,et al.Full-scale impact tests on pipelines[J].International Journal of Impact Engineering,2006,32(08):1267-1283.
[7]WANG Y,QIAN X,LIEW J Y R,et al.Experimental behavior of cement filled pipe-in-pipe composite structures under transverse impact[J].International Journal of Impact Engineering,2014,72:1-16.
[8]QIAN X,WANG Y,LIEW J Y R,et al.A load-indentation formulation for cement composite filled pipe-in-pipe structures[J].Engineering Structures,2015,92:84-100.
[9]ZEINODDINI M,HARDING J E,PARKE G A R.Effect of impact damage on the capacity of tubular steel members of offshore structures[J].Marine Structures,1998,11(04):141-157.
[10]杨秀娟,修宗祥,闫相祯,等.海底管道受坠物撞击的三维仿真研究[J].振动与冲击,2009,28(11):47-50.
[11]杨秀娟,闫涛,修宗祥,等.海底管道受坠物撞击时的弹塑性有限元分析[J].工程力学,2011,28(06):189-194.
[12]黄小光,孙峰.基于ANSYS/LS-DYNA的海底管道受抛锚撞击动力学仿真[J].中国海洋平台,2012,27(05):41-44.
[13]LOU M,MING H Q.The dynamic response analysis of submarine suspended pipeline impacted by dropped objects based on LS-DYNA[J].Marine Science Bulletin,2015,17(02):39-55.
[14]古富强,鲁江姑,王伟,等.重物落水后运动过程的数学模型[J].数学的实践与认识,2011,41(14):100-109.
[15]ZHU L,WANG J,CHENG N S,et al.Settling distance and incipient motion of sandbags in open channel flows[J].American Society of Civil Engineers,2014,130(02):98-103.
[16]HOLLAND K T,GREEN A W,ABELEV A,et al.Parameterization of the in-water motions of falling cylinders using high-speed video[J].Experiments in Fluids,2004,37(05):690-700.
[17]王自力,蒋志勇,顾永宁.船舶碰撞数值仿真的附加质量模型[J].爆炸与冲击,2002,22(04):321-326.
[18]ASME.Gas Transmission and Distribution Piping Systems:ASME B31.8-2010[S].2010.
[19]帅健.管线力学[M].北京:科学出版社,2010.
[20]何璇,钱峰,叶皓,等.含凹陷海底管道安全评价与屈曲机理研究现状[J].轻工机械,2014,32(06):120-125.