海洋工程装备与技术 ›› 2016, Vol. 3 ›› Issue (6): 338-345.

• 专栏:深海浮式平台关键技术研究 • 上一篇    下一篇

疲劳谱分析方法及其在立柱式平台结构分析中的应用

李华祥   

  1. 上海利策科技股份有限公司;
  • 收稿日期:2016-09-30 出版日期:2016-12-25 发布日期:2017-08-14
  • 作者简介:李华祥(1971—),男,博士,主要从事海洋浮式平台设计与高性能计算研究。《海洋工程装备与技术》编委。
  • 基金资助:
     上海市优秀技术带头人项目“深海柱式平台基本设计软件系统开发”(15XD1522200)

 Spectrum Fatigue Analysis Method with Application to the Structural Analysis of Spar Platforms

 LI Hua-xiang   

  1.  Shanghai Richtech Engineering Co., Ltd., Shanghai 200233, China
  • Received:2016-09-30 Online:2016-12-25 Published:2017-08-14
  • Supported by:
     

摘要: 基于海洋疲劳谱分析理论,对海洋桁架型立柱式(Truss Spar)平台的疲劳强度与结构寿命进行分析计算。基于经典波浪疲劳谱理论,开发出一套针对海洋结构的疲劳谱分析程序。同时,依据Goodman理论,将平均应力对疲劳极限的影响进行修订。该疲劳程序与海洋结构有限元分析模块进行无缝连接,实现立柱式平台有限元建模、水动力载荷计算与结构映射、有限元强度计算、疲劳计算的全自动耦合。数值算例计算结果表明,对于在位工况条件桁架型立柱式平台,其结构疲劳失效关键点在硬舱与桁架交接处,这为结构的局部加强和优化设计提供重要参考。

Abstract:  Based on the offshore spectrum fatigue theory, this paper is to calculate the fatigue strength and life predication of truss spar platforms. By means of the classical wave spectrum theory and the engineering fatigue theory, a software tool is developed for the spectrum fatigue analysis of structures. Meanwhile, based on the Goodman theory, the effect of mean stresses on fatigue limit is evaluated. The developed software is linked with a finite element analysis tool for offshore structures. Then, the chain work of finite element modeling, hydrodynamic load calculation and mapping to structural models, finite element strength analysis, and fatigue computation is automatically implemented. Numerical examples indicate that for a truss spar platform, the fatigue failure occurs at the stressed places and the intersection of hard tank and truss, which provides an important reference for local structural reinforcement and optimization.

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