摘要
针对双层海底管道悬跨问题,在充分考虑内外管相互作用的基础上,采用ANSYS软件建立了双层海底管道悬跨振动分析的有限元模型,并对双层管等效成单层管的简化方法及建模方式进行了研究。针对结构非线性、悬跨长度、管土接触长度及海流等因素的影响,对悬跨管线静态及动态响应进行了分析,对影响悬跨管道最大应力位置的因素及变化规律进行了研究,并对双层管与等效单层管的振动特性进行了比较。结果表明:双层管自振频率、跨中静态最大位移量和最大应力的变化对较小管土接触长度敏感,同时由于受悬跨长度和海流速度影响较大,双层管较等效单层管更易引起涡激共振;等效单层管随悬跨长度增大更易发生塑性变形而失效;采用等效单层管替代双层管的方法仅在一定跨长范围内适用。本文研究对双层海底管道悬跨振动特性的研究具有一定的参考意义。
In order to find out a solution to free spanning of submarine pipe in pipe, a finite element model for vibration analysis of spanning submarine pipe in pipe is developed using ANSYS on the basis of considering the interaction between inner and outer pipes. And the modeling method of simplifying pipe in pipe to equivalence single-layer pipeline is studied. The static and dynamic responses of the spanning pipeline are analyzed in view of the influence of structural nonlinearity, free spanning length, pipe-soil contact length and current. The factors affecting the maximum stress location of the spanning pipeline and its law are studied. The vibration behaviors of the pipe in pipe and the equivalent single-layer pipeline are compared. The results show that the natural frequency,the maximum static mid-span displacement and change of the maximum stress of the pipe in pipe are sensitive to short pipe-soil contact length, and pipe in pipe are more susceptible to vortex-induced vibration than equivalent single-layer pipeline due to the greater sensibility to free span length and current velocity. The equivalent single-layer pipe is more prone to failure due to plastic deformation with the increase of free span length. And the method of replacing pipe in pipe with equivalence single-layer pipeline is only valid for a certain span length. The study in this paper is of reference value to the study of the vibration characteristics of free spanning submarine pipe in pipe.
作者
朱红卫
盛积良
姜诗源
李新宏
陈国明
智晨潇
ZHU Hongwei;SHENG Jiliang;JIANG Shiyuan;LI Xinhong;CHEN Guoming;ZHI Chenxiao(Centre for Offshore Engineering and Safety Technology,China University of Petroleum,Qingdao,Shandong 266580,China;CCCC International Shipping Corporation,Tianjin 300451,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2019年第5期190-197,共8页
China Offshore Oil and Gas
基金
国家重点研发计划“临海油气管道及陆上终端风险评估及防控技术（编号：2016YFC0802305）”部分研究成果
关键词
双层海底管道
悬跨
振动
动态响应
管土接触长度
悬跨长度
海流速度
自振频率
最大位移量
最大应力
submarine pipe in pipe
free spanning
vibration
dynamic response
pipe-soil contact length
free span length
current velocity
natural vibration frequency
maximum displacement
maximum stress
