Mooring lines may be damaged under severe conditions during the life of an offshore platform. In the event of a mooring failure, it is possible to break remaining mooring lines in a severe condition, which ultimately leads to the total structural failure; Therefore, the post-failure analysis is very important for the mooring system. In this study, the Amir-Kabir semi-submersible platform has been modeled which is installed in 700 m’ depth of the Caspian Sea, and random waves have been generated towards the structure in the form of the JONSWAP wave spectrum according to the conditions of the Caspian Sea. For analysis, four different mooring configurations have been considered. Then, in each analysis, one of the four mooring lines has been broken during the storm, and the effect of the failure has been analyzed on the platform responses. In other words, the responses of the six degrees of freedom have been compared with each other derived from the analysis. Finally, the optimum mooring configuration has been chosen to reduce structure motions after the mooring failure.

在海上平台的使用寿命期间，在严酷的条件下，系泊缆绳可能会损坏。在系泊故障的情况下，有可能在严重的情况下破坏剩余的系泊绳索，最终导致整个结构失效；因此，故障后分析对于系泊系统非常重要。在本研究中，模拟了安装在里海 700 m' 深处的 Amir-Kabir 半潜平台，并根据以下条件以 JONSWAP 波谱的形式向该结构产生随机波。里海。为了分析，已经考虑了四种不同的系泊配置。然后，在每次分析中，四个系泊缆中的一个在风暴期间被破坏，并分析了故障对平台响应的影响。换句话说，六个自由度的响应已经从分析中得到相互比较。最后，选择了最佳系泊配置以减少系泊故障后的结构运动。