杭州湾海底管道悬跨涡激疲劳精细分析-2e71d42a.pdf

海洋工程

DOI：10.3969/j.issn.1001-2206.2022.06.004

杭州湾海底管道悬跨涡激疲劳精细分析

曹国民

国家管网集团东部原油储运有限公司，江苏徐州221008

摘要：根据历年检测资料可知杭州湾海底管道某些管段存在不同程度悬跨现象，管跨涡激振动是引发海底管

道疲劳失效的主要因素之一。根据杭州湾海底管道所在海域底层流速检测数据，近似估算杭州湾海底管道所在

海域底层流速分布，利用FLUENT模拟管跨涡激升、曳力，在ANSYS中建立管土耦合非线性有限元模型，依

据Miner线性累积损伤理论，采用雨流计数和S-N曲线法计算管跨在海流作用下的疲劳损伤和疲劳寿命，分

析管道疲劳损伤影响因素并提出工程对策。研究结果表明，杭州湾海底管道所在海域底层流速服从正态分布，

带阻流板管道涡激升力存在严重非对称性，管跨危险节点均位于管跨中点，杭州湾海底管跨疲劳损伤对海底流

速最为敏感，跨长次之，跨长和流速是管跨结构疲劳损伤的主导因素，土壤剪切强度及输送介质温度对管道疲

劳损伤的影响不明显。

关键词：海底管道；悬跨；管土耦合；涡激振动；疲劳寿命预测；敏感分析

Vortex-inducedfatigueanalysisofHangzhouBaysubseapipelineswitha

suspendedspan

CAOGuomin

PipeChinaEasternCrudeOilStorageTransportationCo.,Ltd.,Xuzhou221008,China

Abstract：Accordingtosurveydatacollectedinrecentyears,itisrecognizedthatthesuspendedspanphenomenontovaryingdegrees

occursinsomepartsofHangzhouBaysubseapipelines.Thevortex-inducedvibration(VIV)ofpipelinespanisoneofthemainfactors

thatresultinfatiguefailureofsubseapipelines.OnthebasisofthebottomcurrentvelocitydataofseaareaswithHangzhouBaysubsea

pipelines,thebottomcurrentvelocitydistributionofseaareaswithHangzhouBaysubseapipelineswasestimated.Inaddition,FLUENT

softwarewasusedtosimulatethevortex-inducedliftanddragforcesofthepipelinespan,andanon-linearpipe-soilcouplingfinite

elementmodelwasdevelopedintheANSYSsystem.AccordingtotheMinerlinearcumulativedamagetheory,thefatiguedamageand

lifeofthepipelinespanundertheactionofseacurrentswerecalculatedthroughrain-flowcountingandS-Ncurvemethods,andthe

influencingfactorofpipelinefatiguedamagewasanalyzed,withengineeringcountermeasuresproposed.Theresultsshowthatthebottom

currentvelocityofseaareaswithHangzhouBaysubseapipelinesobeysnormaldistribution,andthevortex-inducedliftforceof

pipelineswithspoilersisseverelyasymmetric.Furthermore,thedangerouspointsarealllocatedatthemidpointofthepipelinespan.

ThefatiguedamageofHangzhouBaysubseapipelineswithasuspendedspanisthemostsensitivetothebottomcurrentvelocity,with

thespanlengthtakingsecondplace.Thespanlengthandcurrentveloc