| 基于实测应力的半潜平台疲劳损伤分析 |
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| 引用本文： | 武博,王璞,李欣,杨建民.基于实测应力的半潜平台疲劳损伤分析[J].海洋工程,2020,38(2):17-26. |
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| 作者姓名： | 武博 王璞 李欣 杨建民 |
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| 作者单位： | 上海交通大学 海洋工程国家重点实验室, 上海 200240;高新船舶与深海开发装备协同创新中心, 上海 200240,中国船舶工业集团公司第708研究所, 上海 200011,上海交通大学 海洋工程国家重点实验室, 上海 200240;高新船舶与深海开发装备协同创新中心, 上海 200240,上海交通大学 海洋工程国家重点实验室, 上海 200240;高新船舶与深海开发装备协同创新中心, 上海 200240 |
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| 基金项目： | 工信部《第七代超深水钻井平台（船）创新专项课题三：第七代超深水钻井船开发》资助项目 |
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| 摘 要： | 疲劳破坏是海洋结构物发生破坏的一种主要形式,深水半潜平台在海上运输、作业、停滞时会受到交变的风、浪、流载荷作用,进而引起结构关键节点处的疲劳损伤,影响平台安全性。以"海洋石油981"半潜钻井平台为研究对象,利用光纤光栅应变传感器对结构高应力区进行应力监测,获取测点处应力时历数据。将监测位置划分为四个监测板块,采用四点雨流计数法对测点应力进行处理,得到以离散形式给出的应力循环幅度与相应循环周次。参照DNV《海上钢结构疲劳设计规范》推荐的S-N曲线,基于Miner线性疲劳累计损伤原则,得到各个测点处的总体疲劳损伤度。选取具有最大疲劳损伤度的危险测点,并结合海上实测总时长,预测半潜平台的总体疲劳寿命。
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| 关 键 词： | 应力监测 疲劳损伤 雨流计数法 Miner准则 S-N曲线 |
| 收稿时间： | 2019/5/14 0:00:00 |
Fatigue damage analysis of semi-submersible platform based on field-measured stress |
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| WU Bo,WANG Pu,LI Xin and YANG Jianmin.Fatigue damage analysis of semi-submersible platform based on field-measured stress[J].Ocean Engineering,2020,38(2):17-26. |
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| Authors: | WU Bo WANG Pu LI Xin and YANG Jianmin |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China,Marine Design & Research Institute of China, Shanghai 200011, China,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China |
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| Abstract: | Fatigue damage is a typical form of damage to marine structures. When moving, operating and staying at sea, the deep-water semi-submersible platform would be subjected to alternating wind, wave and current loads, which can cause fatigue damage at key structural joints and threaten the safety of the platform. Take "Haiyang Shiyou 981" drilling platform as a research object, the stresses on the high-stress areas of the structure are monitored using fiber Bragg grating strain sensor in order to obtain the stress time history data. The location of the measuring points is divided into four monitoring sections, and the four-point rain-flow counting method is used to deal with the stresses of the measuring points. The stress cycling amplitudes and corresponding cycling times at the location of measuring points are obtained in discrete form. Based on Miner''s principle of cumulative linear fatigue damage, the overall fatigue damages at the location of measuring points are obtained referring to the S-N curves recommended by fatigue design of offshore steel structures of DNV. The measuring point with the biggest fatigue damage is selected and the total fatigue life of the semi-submersible platform is predicted based on the total field-measured time. |
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| Keywords: | stress monitoring fatigue damage rain-flow counting method Miner''s principle S-N curves |
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