吴剑国,陈育,阮伟东,李智博.波频和慢漂组合作用下钢悬链线立管疲劳损伤研究[J].海洋工程,2019,37(6):1~11
波频和慢漂组合作用下钢悬链线立管疲劳损伤研究
Study on the fatigue damage of SCR with vessel wave frequency and slow drift combined motions
  
DOI:10.16483/j.issn.1005-9865.2019.06.001
中文关键词:  钢悬链线立管  位置组合叠加  波频和慢漂组合运动  疲劳损伤
英文关键词:steel catenary riser  position combination superposition  wave frequency and slow drift combined motion  fatigue damage
基金项目:浙江省自然科学基金项目(LQ19E090009);国家自然科学基金项目(51909236)
作者单位E-mail
吴剑国 浙江工业大学 建筑工程学院浙江 杭州 310023 wujg63@163.com 
陈育 浙江工业大学 建筑工程学院浙江 杭州 310023  
阮伟东 浙江工业大学 建筑工程学院浙江 杭州 310023 wdruan@zju.edu.cn 
李智博 中国船级社海洋工程技术中心北京 100007  
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中文摘要:
      为了有效地考虑浮体慢漂运动对钢悬链线立管疲劳损伤的影响,提出了波频和慢漂运动组合作用下钢悬链线立管疲劳损伤简化计算的位置组合叠加法。其核心是:基于浮体慢漂运动概率分布选取若干典型慢漂位置,进行波频运动作用下钢悬链线立管动力响应分析;根据钢悬链线立管运动位置变化特征,截取若干慢漂位置对应的波频应力时程叠加到慢漂应力时程上,得到波频和慢漂运动的组合应力时程;编写基于雨流计数法的MATLAB程序处理立管各节点应力,采用海水环境下DoE.E型S N曲线和Palmgren Miner累积损伤准则计算立管各节点疲劳损伤。应用位置组合叠加法对某海域500 m水深的立管进行了疲劳分析,并与全耦合法、权重组合叠加法以及波频和慢漂疲劳损伤简单相加法的结果进行了对比,结果表明该方法具有较高的精度和效率。此外,进行了区域设定系数、波浪高度、波浪周期和土壤表面剪切强度等参数对组合作用下立管疲劳损伤的敏感性分析。
英文摘要:
      In order to consider the fatigue damage of steel catenary riser (SCR) induced by the floating body slow drift motion, a simplified method of position combination superposition for calculating the fatigue damage of SCR with vessel wave frequency and slow drift combined motions is proposed in this paper. The key of this study is to conduct the dynamic analysis of SCR with wave frequency motion by selecting several typical slow drift positions based on the probability distribution of floating body slow drift motion. According to the variation characteristics of SCR motion, the wave frequency stress time history corresponding to each slow drift position is superimposed to the slow drift stress time history to obtain the combined stress time history response. On the basis of rain flow counting method, a MATLAB program is written to deal with the riser nodal stress, then the DoE. E S N curve for seawater environment and Palmgren Miner accumulative damage criterion are adopted to calculate the fatigue damage of the SCR. The fatigue of a riser in a certain sea area with 500 m depth is analyzed by the proposed method. Compared with the calculation results of the fully coupled method, weighted combination superposition method and simple addition method of wave frequency and slow drift fatigue damage, it is found that the proposed simplified fatigue calculation method owns high precision and efficiency. The influences of sensitivity parameters such as zone setting coefficient, wave height and period, shear strength of soil surface on the fatigue damage under combined action are also investigated.
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