地震工程学报Issue(4)：773-777,789,6.DOI:10.3969/j.issn.1000-0844.2014.04.0773
非对称管-土边界的海底悬跨管道涡激振动特性
Vortex-induced Vibrations of a Free-span Submarine Pipeline under Asymmetric Pipe-soil Boundary Conditions
摘要
Abstract
The submarine pipeline from offshore petroleum fields must frequently pass over une-ven seafloor areas.In such cases,the pipeline may have free spans when crossing depressions.If dy-namic loads occur,the free span may oscillate,and time-varying stresses may create unacceptable fatigue damage.A major source for dynamic stresses in free-span pipelines is vortex-induced vibra-tion (VIV)caused by steady current.This effect is dominant on deep water pipelines because wave-induced velocities and accelerations decay with increasing water depth.Vortex-induced vibra-tions in a free-span pipeline are a highly complex phenomenon in which the fluid-pipeline-soil cou-pling should be considered.One challenge for free-span analysis relates to accurate prediction of VIV and design of a pipeline system to mitigate its effects.In this paper,VIV of a free-span pipe-line under asymmetric boundary conditions is analyzed.The submarine pipeline was modeled by u-sing an Euler-Bernoulli beam.The two ends were restrained by an extension spring and a twist spring.The wake flow was described by Van der pol equation,and a wake oscillator model was in-troduced.The model parameters were estimated according to experimental data.The coupling e-quations were decoupled by the modal principle,and the numerical results were obtained by Runge-Kutta method.It was concluded that stricter asymmetric boundary conditions relate to more difficulty in the high mode and higher response frequency,which had little effect on the re-sponse amplitude.关键词
悬跨/涡激振动/非对称管-土边界/海底管道Key words
free-span/vortex-induced vibration (VIV)/asymmetric pipe-soil boundary condition分类
通用工业技术引用本文复制引用
徐万海,谢武德,高喜峰,任钟书..非对称管-土边界的海底悬跨管道涡激振动特性[J].地震工程学报,2014,(4):773-777,789,6.基金项目
国家自然科学基金(51209161,51479135,51379144) （51209161,51479135,51379144）
中国博士后科学基金(2013M530116) （2013M530116）
国家重点基础研究计划-973计划(2014CB046801) （2014CB046801）
