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中文摘要：
为了探讨对深海钢悬链立管顶端应力接头更加准确而有效的疲劳分析方法,采用了多轴疲劳理论进行寿命估算.应力接头连接立管和平台长期处于海洋环境载荷及海洋腐蚀之下,非线性特征明显,疲劳问题突出.首先对钢悬链立管进行海洋环境载荷下的时域总体动力分析,然后对应力接头进行局部分析,最后利用多轴疲劳理论对应力接头进行寿命估算和初步的参数研究.研究结果表明,以应力值作为单一的结构安全性评判标准是不够的,在交变载荷作用下疲劳分析是必要的.相比单轴疲劳分析而言,多轴疲劳分析能更加真实的反应结构的疲劳损伤情况,尤其在深海钢悬链立管结构分析中,多轴疲劳问题应给予充分的关注.
英文摘要：
The object of this paper is to present a more accurate and useful method for fatigue analysis and life prediction for a stress joint of a deepwater steel catenary riser.The stress joint was used to connect the riser and platform,and it was subjected to ocean environmental loadings and erosion;thus,the fatigue problem is critical.First,global time domain dynamic analysis of the steel catenary riser was performed,and then local analysis was performed for the stress joint.Finally,the fatigue life of the stress joint was evaluated according to the multiaxial fatigue theory,and a preliminary parametric study was also carried out.Results show that taking stress value of the structure as the only criterion is not enough,and fatigue analysis is necessary when the structure is subjected to an alternating load.Compared with uniaxial analysis,multiaxial fatigue analysis can reflect the damage of the structure more realistically.Especially for deepwater steel catenary risers,multiaxial fatigue problems should be given close attention.
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