Fatigue Life Comparison of Modified and Conventional 3 Leg Jacket Offshore Structure

Muhammad Nabil Ghiffary, Murdjito, R. Prastianto
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Abstract

The jacket structure must be adapted to the conditions of the production field to support economic factors. So, the concept of a modular platform for minimal, low-cost facilities is adopted. However, the design differences will affect the performance of the jacket itself, in other words a modular jacket can withstand the same load as a conventional jacket model but has a different structural performance. Therefore, this research discusses the performance comparison, which includes the fatigue life and the natural period, between conventional and modular jacket structures, which in this study are referred to as modified jackets. Conventional jacket as a comparison structure takes the design basis of the modified structure, including the same structural profiles, and environmental loads. In this study, the two jackets will only be modeled on the jacket part and the superstructure will be modeled as a joint load on the three upper ends of the jacket legs. Fatigue life analysis in this study used the full spectral analysis method. By using SACS software, the natural period of modified jacket is 1.756 s and conventional jacket is 1.472 s. While the lowest fatigue life on modified jacket is 44.98 years and conventional jacket is 9125.79 years.
改进与常规三腿导管架海上结构疲劳寿命比较
夹套结构必须适应生产现场的条件,以支持经济因素。因此,采用模块化平台的概念来实现最小的、低成本的设施。但是,设计差异会影响导管套本身的性能,换句话说,模块化导管套可以承受与传统导管套模型相同的载荷,但具有不同的结构性能。因此,本研究讨论了传统夹套结构与模块化夹套结构(本研究中称为改型夹套)的性能比较,包括疲劳寿命和自然周期。常规夹套作为一种比较结构,其设计依据是修改后的结构,包括相同的结构外形和环境荷载。在本研究中,两个护套将只在护套部分进行建模,上部结构将作为护套腿三个上端的联合荷载进行建模。本研究的疲劳寿命分析采用全谱分析方法。利用SACS软件计算,改进后的夹套自然周期为1.756 s,常规夹套自然周期为1.472 s。而改进夹套的最低疲劳寿命为44.98年,常规夹套的最低疲劳寿命为9125.79年。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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