深海管道在冲击载荷作用下的局部屈曲特性研究
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摘要
水下落物撞击是海底管道的主要事故形式之一,而深水环境下的落物撞击是高静水压联合落物冲击载荷作用下的结构响应过程.采用LS-DYNA有限元软件建立了管道、海床数值模型,模拟外界水压和冲击载荷联合作用下结构动态响应过程,并通过全尺寸落物撞击实验结果验证了模型方法的可靠性.利用验证的模型方法,研究了外界水压对管道碰撞损伤及屈曲失稳的影响.研究表明:落物撞击主要对管道结构的初始稳定性造成影响,静水压力的附加做功加剧了管道的局部塑性变形.同时,随着外界水压增大,碰撞初始阶段的塑性变形越大,甚至在高静水压作用下发生即刻的屈曲失稳破坏.研究结果对复杂动力载荷作用下深海管道结构安全评估具有一定的参考价值.
The impact of a dropped objects under water is one of the main forms of submarine pipeline accidents. While in deep water,the submarine pipelines suffers the combined effect of a high hydrostatic pressure and the impact load. A numerical model of the pipeline and seabed is established using LS-DYNA finite element software,that simulates the dynamic response process of structure under the combined action of the external hydrostatic pressure and impact load. The simulations are verified by the results of full-scale dropped object impact tests. The effect of external hydrostatic pressure on the collision damage and buckling of the pipe is studied by the verified model. The results show that the impact of falling objects mainly affects the initial stability of pipeline structure. Meanwhile,the additional work of hydrostatic pressure increases the local plastic deformation of the pipe. The plastic deformation at the initial stage of the collision becomes more serious with the increase of external hydrostatic pressure,and buckling even occurs instantaneously when the pipeline is exposed to a high enough hydrostatic pressure. The research results provide reference for the safety assessment of deep-sea pipeline structures under complex dynamic loading.
The impact of a dropped objects under water is one of the main forms of submarine pipeline accidents. While in deep water,the submarine pipelines suffers the combined effect of a high hydrostatic pressure and the impact load. A numerical model of the pipeline and seabed is established using LS-DYNA finite element software,that simulates the dynamic response process of structure under the combined action of the external hydrostatic pressure and impact load. The simulations are verified by the results of full-scale dropped object impact tests. The effect of external hydrostatic pressure on the collision damage and buckling of the pipe is studied by the verified model. The results show that the impact of falling objects mainly affects the initial stability of pipeline structure. Meanwhile,the additional work of hydrostatic pressure increases the local plastic deformation of the pipe. The plastic deformation at the initial stage of the collision becomes more serious with the increase of external hydrostatic pressure,and buckling even occurs instantaneously when the pipeline is exposed to a high enough hydrostatic pressure. The research results provide reference for the safety assessment of deep-sea pipeline structures under complex dynamic loading.
引文
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[15]赵保磊,余建星,孙震洲,等.深水管道在动力载荷作用下的局部压溃特性研究[J].振动与冲击,2017,36(17):104-110.Zhao Baolei,Yu Jianxing,Sun Zhenzhou,et al.Local pressure collapse characteristics of a deep water pipeline under dynamic loading[J].Journal of Vibration and Shock,2017,36(17):104-110(in Chinese).
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[18]Benjamin A C,Freire J L F,Vieira R D,et al.Interaction of corrosion defects in pipelines-Part 2:MTI JIP database of corroded pipe tests[J].International Journal of Pressure Vessels&Piping,2016,145:41-59.
[2]Palmer A,Touhey M,Si H,et al.Full-scale impact tests on pipelines[J].International Journal of Impact Engineering,2006,32(8):1267-1283.
[3]Zhu Hongjun,Lin Pengzhi,Pan Qian.A CFD(computational fluid dynamic)simulation for oil leakage from damaged submarine pipeline[J].Energy,2014,64(1):887-899.
[4]Zhu Hongjun,You Jiahui,Zhao Honglei.Underwater spreading and surface drifting of oil spilled from a submarine pipeline under the combined action of wave and current[J].Applied Ocean Research,2017,64:217-235.
[5]海洋石油工程股份有限公司.深水水下应急维修调研报告[R].天津:国家重大专项27-005-001-003-RPT-GE-001,2015.Offshore Oil Co Ltd.The Survey Report for the DeepWater Emergency Maintenance[R].Tianjin:National Science and Technology Major Project 27-005-001-003-RPT-GE-001,2015(in Chinese).
[6]Jones N,Birch S E,Birch R S,et al.Experimental study on the lateral impact of fully clamped mild steel pipes[J].ARCHIVE Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering 1989-1996,1992,206(25):111-127.
[7]Jones N,Shen W Q.A theoretical study of the lateral impact of fully clamped pipelines[J].ARCHIVE Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering 1989-1996,1992,206(206):129-146.
[8]Yu Jianxing,Zhao Yiyu,Li Tianyu,Yu Yang.A threedimensional numerical method to study pipeline deformations due to transverse impacts from dropped anchors[J].Thin-Walled Structures,2016,103:22-32.
[9]Yang J L,Lu G Y,Yu T X.Experimental study and numerical simulation of pipe-on-pipe impact[J].International Journal of Impact Engineering,2009,36:1259-1268.
[10]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(6):189-194.Yang Xiujuan,Yan Tao,Xiu Zongxiang,et al.Elasticplastic finite element analysis of submarine pipeline impacted by dropped objects[J].Engineering Mechanics,2011,28(6):189-194(in Chinese).
[11]Liang Jing,Yu Jianxing,Yu Yang.Energy transfer mechanism and probability analysis of submarine pipe laterally impacted by dropped objects[J].China Ocean Engineering,2016,30(3):319-328.
[12]Zhu Ling,Liu Qingyang,Jones N,et al.Experimental study on the deformation of fully clamped pipes under lateral impact[J].International Journal of Impact Engineering,2018,111:94-105.
[13]Zeinoddini M,Harding J E,Parke G.Axially pre-load steel tubes subjected to lateral inpacts(a numerical simulation)[J].International Journal of Impact Engineering,2008,35(11):1267-1279.
[14]Martin Kristoffersen,Folco Casadei,Tore B?rvik.Impact against empty and water-filled X65 steel pipes:Experiments and simulations[J].International Journal of Impact Engineering,2014,71(6):73-88.
[15]赵保磊,余建星,孙震洲,等.深水管道在动力载荷作用下的局部压溃特性研究[J].振动与冲击,2017,36(17):104-110.Zhao Baolei,Yu Jianxing,Sun Zhenzhou,et al.Local pressure collapse characteristics of a deep water pipeline under dynamic loading[J].Journal of Vibration and Shock,2017,36(17):104-110(in Chinese).
[16]Det Norske Veritas.Recommended Practice.DNV-RP-F107:Risk Assessment of Pipeline Protection[S].DNV,2010.
[17]Jones N.Structure Impact[M].Cambridge:Cambridge University Press,1989:211-247.
[18]Benjamin A C,Freire J L F,Vieira R D,et al.Interaction of corrosion defects in pipelines-Part 2:MTI JIP database of corroded pipe tests[J].International Journal of Pressure Vessels&Piping,2016,145:41-59.
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