深海钢悬链线立管腐蚀疲劳性能分析  

Analysis of Corrosion Fatigue Performance of Steel Catenary Risers in Deep-sea

作　　者：巴宁 张苗苗 汪菁 刘晖[1,2,4] BA Ning;ZHANG Miao-miao;WANG Jing;LIU Hui(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572025,China;Design and Research Institute of Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Roadway Bridge&.Structure Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉理工大学海南三亚科教创新园,三亚572025 [3]武汉理工大学设计研究院,武汉430070 [4]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070

出　　处：《武汉理工大学学报》2024年第6期46-53,共8页Journal of Wuhan University of Technology

基　　金：三亚市科技创新专项项目(2022KJCX34)。

摘　　要：通过X70钢标准挂片模拟深海环境腐蚀试验得到腐蚀速率和腐蚀深度时变模型,采用数值模拟得到X70钢有腐蚀影响的疲劳曲线。针对不同腐蚀时间的立管,建立平台-立管-管土作用的整体模型,分析立管在环境荷载、腐蚀与内流作用下的动力响应。最后,基于Miner线性损伤累积准则分析不同腐蚀时间立管的疲劳寿命。结果表明,立管腐蚀疲劳寿命随腐蚀年限增加而显著减少。在腐蚀时间为5年、内流流速分别为2 m/s和5 m/s时,立管触地端节点疲劳寿命分别为437.31年和89.00年,内流流速为5m/s时的疲劳寿命仅为内流流速为2 m/s时的20.36%;然而,当立管未腐蚀时,内流流速为2 m/s和5 m/s时的疲劳寿命分别高达3.72×10^(9)年和1.41×10^(7)年。因此,为确保立管运营安全,不仅要采取有效防腐措施,还需将内流流速控制在安全流速范围内。A corrosion rate and depth time-varying model for X70 steel was obtained by simulating corrosion tests in a deep-sea environment using standard hanging strips.By employing numerical simulations,the fatigue curve for X70 steel with corrosion effects was derived.Next,an integral model incorporating the platform-SCR-soil interaction was developed to analyze the dynamic response of the SCR under environmental loading,corrosion,and internal flow effects for different corrosion durations.Finally,the fatigue life of the SCR with different corrosion durations was analyzed based on the Miner linear damage accumulation criterion.The research findings indicate that the fatigue life of the SCR significantly decreases with increasing corrosion duration.For a corrosion duration of 5 years and internal flow velocities of 2 m/s and 5 m/s,the fatigue life of node at the touchdown point of the SCR was found to be 437.31 years and 89.00 years,respectively.The fa-tigue life at an internal flow velocity of 5 m/s was only 20.36%of the fatigue life at an internal flow velocity of 2 m/s.However,in the absence of corrosion,the fatigue life at internal flow velocities of 2 m/s and 5 m/s was considerably high-er,reaching 3.72×10^(9) years and 1.41×10^(7) years,respectively.Therefore,to ensure the safe operation of SCRs,effective corrosion prevention measures should be implemented,and the internal flow velocity should be controlled within a safe range.

关 键 词：钢悬链线立管 腐蚀疲劳性能 深海环境 X70钢 腐蚀疲劳曲线 

分 类 号：P756.2[天文地球—海洋科学]