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基于悬链线理论及立管与海床接触模型,建立了一种估算立管疲劳寿命的方法,模型中考虑了深水浮式平台运动过程中立管悬链线形状的变化及触地区域海床接触刚度大小对疲劳寿命的影响。分析表明:浮式平台的运动会引起立管悬链线形状的改变以及立管内部应力的重新分布,这是引起立管疲劳损坏的主要原因;随着海床土体刚度的增大,立管疲劳寿命逐渐降低,为了获得准确的立管寿命,有必要对海底土体进行更为全面细致的研究。通过与现有分析方法比较,本方法具有计算方便快捷,结果可靠等优点。研究可为钢悬链线立管的设计分析提供一定的参考。
Based on the catenary theory and the riser-sea contact model, a method of estimating the riser fatigue life is established. The model takes into account the change of the shape of the riser’s catenary during the movement of the deep-water floating platform, Effect of contact stiffness on fatigue life. The analysis shows that the movement of the floating platform will cause the change of the shape of the riser catenary and the redistribution of the stress inside the riser, which is the main cause of fatigue damage to the riser. As the stiffness of the soil increases, the riser Fatigue life is gradually reduced, in order to obtain accurate riser life, it is necessary to carry out a more comprehensive and meticulous study of the submarine soil. Compared with the existing analysis methods, the method has the advantages of convenient and quick calculation, reliable results and so on. The research can provide certain reference for the design analysis of steel catenary riser.