Ship & Boat ›› 2021, Vol. 32 ›› Issue (03): 39-46.DOI: 10.19423/j.cnki.31-1561/u.2021.03.039

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Time-Varying Reliability Analysis of Ultimate Strength of Semi-Submersible Platform During Lateral Splitting and Closing

QIAN Cheng-long1, ZHAO Nan2, WANG Pu3, LI Jun-hui1, WU Jian-guo1   

  1. 1. School of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China;
    2. China Ship Scientific Research Center, Wuxi 214082, China;
    3. Marine Design & Research Institute of China, Shanghai 200011, China
  • Received:2020-10-30 Revised:2020-12-03 Online:2021-06-25 Published:2021-07-02

半潜式平台横向开闭极限强度的时变可靠性分析

钱呈龙1, 赵南2, 王璞3, 李钧晖1, 吴剑国1   

  1. 1.浙江工业大学 土木工程学院 杭州310023;
    2.中国船舶科学研究中心 无锡214082;
    3.中国船舶及海洋工程设计研究院 上海200011
  • 作者简介:钱呈龙（1996-）,男,硕士。研究方向：结构工程。赵 南（1985-）,男,博士,工程师。研究方向：船舶及海洋工程结构物结构强度。王 璞（1977-）,男,硕士,研究员。研究方向：海洋工程浮式结构设计与研究。李钧晖（1995-）,男,硕士。研究方向：结构工程。吴剑国（1963-）,男,博士,教授/博导。研究方向：船舶及海洋工程结构力学。

Abstract: The Smith method has been improved to calculate the ultimate strength of the semi-submersible platform during splitting and closing when considering the overall instability of the brace, in order to study the influence of the fatigue and corrosion on the reliability of the structural ultimate strength of the semi-submersible platform. A random time-varying model of the structural ultimate strength of the platform considering the effects of fatigue and corrosion is established based on the random process theory. The time-varying models of wave loads and hydrostatic loads are established for a semi-submersible platform. The time-varying reliability of the platform structure is calculated by using the parallel system method, and is compared with the annual instantaneous reliability.

Key words: semi-submersible platform, ultimate strength, time-varying reliability, fatigue, corrosion

摘要： 为了研究疲劳和腐蚀对半潜式平台结构极限强度可靠性的影响,文章改进了Smith方法,使之能够用于计及撑杆整体失稳的半潜式平台对开、对闭的极限强度计算;基于随机过程理论,建立计及疲劳和腐蚀作用的平台结构极限强度随机时变模型;针对某半潜式平台,建立波浪载荷和静水载荷随时间的变化模型,使用并联系统方法计算平台结构的时变可靠性,并与年度瞬时可靠性进行比较。

关键词: 半潜式平台, 极限强度, 时变可靠性, 疲劳, 腐蚀

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