可移动自升式井口平台的桩靴疲劳寿命分析  

Fatigue life analysis of spud can on a mobile self-elevating wellhead platform

作　　者：李行 陈第一 周崇尧 蒋颐 唐霖 严晓扬 李镜 屈衍 LI Xing;CHEN Diyi;ZHOU Chongyao;JIANG Yi;TANG Lin;YAN Xiaoyang;LI Jing;QU Yan(Zhanjiang Branch of CNOOC Energy Development Equipment Technology Co.,Ltd.,Zhanjiang 524057,China;School of Marine Science and Engineering,South China University of Technology,Guangzhou 511442,China;Deep Sea Technology Limited Company of Shenzhen,Shenzhen 518110,China)

机构地区：[1]中海油能源发展装备技术有限公司湛江分公司,广东湛江524057 [2]华南理工大学海洋科学与工程学院,广东广州511442 [3]深洋海工技术(深圳)有限公司,广东深圳518110

出　　处：《应用科技》2024年第3期29-35,共7页Applied Science and Technology

基　　金：国家自然科学基金项目(41976195,51679033).

摘　　要：针对可移动自升式井口平台(WZ12-8E WHPA)中桩靴的结构型式,考虑了波浪、洋流、土壤特性和腐蚀等综合环境,计算和预测其在8个不同浪向海况下的结构应力和疲劳寿命。首先采用Longuet-Higgins模型将随机波谱转化为规则波谱,并借助SACS软件展开整体分析,获得桩腿截断处的剪力、弯矩和轴向力传递函数。之后借助ABAQUS对桩靴模型开展局部详细受力分析。以计算应力结果为循环幅值,以年统计波数为循环次数,采用Miner累计损伤准则进行损伤评估,最终获得桩靴的疲劳寿命。并对比了美国船级社和挪威船级社两种规范中的S-N曲线对评估其疲劳寿命的差异,为评估和预测桩靴的疲劳寿命提供可借鉴的计算方法。Aiming at the structural form of spud can in the mobile self-elevating wellhead platform(WZ12-8E WHPA),its structural stress and fatigue life are calculated and predicted under eight different wave directions,considering the comprehensive environment of wave,ocean current,soil characteristics and corrosion.Firstly,the Longuet-Higgins model is used to convert random wave spectrum into regular wave spectrum,and the overall analysis is carried out by the software SACS,obtaining the shear force,bending moment and axial force transfer function at the pile leg section.Afterwards,the detailed local stress analysis of the spud can model is carried out with the aid of ABAQUS.Taking the calculated stress result as the cycle amplitude,the annual statistical number of waves as the cycle number,the damage is evaluated based on the Miner cumulative damage criterion,finally obtaining the fatigue life of the spud can.The differences of S-N curves in ABS and DNV specifications in evaluating the fatigue life of spud can are compared.

关 键 词：桩靴 随机波谱 损伤准则 疲劳寿命 S-N曲线 循环幅值 不同浪向 结构应力 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]