可移动自升式井口平台的立管强度和疲劳寿命分析  

Strength and Fatigue Life Analysis of the Risers for Mobile Jack-up Wellhead Platform

作　　者：李行 邹科 陈第一 周崇尧 屈衍 严晓扬 唐霖 李镜 LI Xing;ZOU Ke;CHEN Di-yi;ZHOU Chong-yao;QU Yan;YAN Xiao-yang;TANG Lin;LI Jing(Zhanjiang Branch of CNOOC Energy Development Equipment Technology Co.Ltd.,Zhanjiang Guangdong 524057,China;Deep Sea Technology(Shenzhen)Limited Company,Shenzhen Guangdong 518067,China;School of Marine Science and Engineering,South China University of Technology,Guangzhou 511442,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]深洋海工技术(深圳)有限公司,广东深圳518110 [3]华南理工大学海洋科学与工程学院,广州511442

出　　处：《船海工程》2024年第2期115-120,共6页Ship & Ocean Engineering

基　　金：国家自然科学基金(41976195,51679033);国家研发计划(2016YFC0303400)。

摘　　要：针对自升式海上平台中两种结构形式的WZ12-8E/W立管,考虑波浪、洋流、土壤特性、附着海生物、温度和腐蚀等综合环境,计算和分析不同设计水位工况下,两种立管在平台移动下的结构强度,并校核是否发生涡激振动,以及预测交变载荷作用下的疲劳寿命。借助ORCAFLEX有限元软件,计算两种立管在多种海况下的动态响应,并把弯矩和张力转化为应力值。利用S-N曲线、雨流计数法和Miner累积损伤准则预测其疲劳寿命,并分别累计0°、45°和90°每个方向下37个工况的疲劳损伤。计算发现两种立管在作业和极端工况下,不会发生涡激振动,强度满足设计要求;但发现疲劳损伤较大且不满足设计寿命要求的结构区域,并提出增加疲劳寿命的改进方法。Considering the integrated environment of wave,ocean current,soil characteristics,attached marine organisms,temperature and corrosion,the structural strength of two types of WZ12-8E/W risers during the movement of a self-elevating offshore platform under different design water level conditions was calculated and analyzed,and the vortex-induced vibration was checked for occurrence and the fatigue life of the two risers under alternating loads was predicted.The ORCAFLEX software was used to calculate the dynamic response of the two risers at each sea conditions,and the bending moment and tension were converted into stress values.The fatigue life was predicted using S-N curve,rain-flow counting method,and Miner cumulative damage criterion.The accumulate fatigue damage for 37 conditions in each direction at 0°,45° and 90° was calculated respectively.The results showed that the two types of risers will not undergo vortex induced vibration under operating and extreme conditions,and their strength meets the design requirements.It was also found that the structural areas with significant fatigue damage does not meet the design life requirements;an improved method to increase the fatigue life was put forward.

关 键 词：平台立管 动态响应 结构强度 涡激振动 疲劳寿命 

分 类 号：U661.4[交通运输工程—船舶及航道工程] P751[交通运输工程—船舶与海洋工程]