随着深海油气开发向更深水域推进，1500 m水深钢悬链线立管（Steel Catenary Riser，SCR）作为关键输送通道，其结构动力学特性与疲劳寿命直接制约工程安全与运营效益。本文以该类立管为研究对象，基于Nastran软件构建壳-梁混合有限元模型，通过网格收敛性验证与边界条件优化确保模型可靠性；随后开展模态分析与瞬态动力学分析，求解立管固有频率、振型及动态响应规律，识别易与海洋环境载荷共振的风险模态；最后结合Miner线性累积损伤理论与材料S-N曲线进行疲劳分析，通过仿真与试验数据对比验证分析方法的适用性。分析表明所建模型对SCR动态特性的模拟误差控制在3%以内，成功识别出2阶关键共振风险模态，预测的立管疲劳寿命达28.6年，满足深海工程25年设计寿命要求。
With the advancement of deep-sea oil and gas development towards deeper waters, the 1500-meter water depth Steel Catenary Riser (SCR), as a key transportation channel, has its structural dynamic characteristics and fatigue life directly restricting engineering safety and operational efficiency. This study takes this type of riser as the research object and establishes a shell-beam hybrid finite element model based on the Nastran software. The reliability of the model is ensured through mesh convergence verification and boundary condition optimization; subsequently, modal analysis and transient dynamic analysis are carried out to solve the natural frequency, vibration mode and dynamic response law of the riser, and identify the risk modes prone to resonance with marine environmental loads; finally, fatigue analysis is performed by combining the Miner linear cumulative damage theory and material S-N curve, and the applicability of the analysis method is verified by comparing simulation and test data. The analysis shows that the simulation error of the established model for the dynamic characteristics of SCR is controlled within 3%, and two orders of key resonance risk modes are successfully identified. The predicted fatigue life of the riser reaches 28.6 years, which meets the 25-year design life requirement for deep-sea engineering, and the proposed analysis method provides accurate and reliable technical support for the structural optimization and safety assessment of SCR.
2025,47(24): 159-162 收稿日期：2025-6-12
DOI：10.3404/j.issn.1672-7649.2025.24.025
分类号：U664.82；TB123
作者简介：陈秉权(1985-),男,验船师,研究方向为船舶与海洋工程
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