| 杜长江, 张萌萌, 付世晓, 孟宇, 崔晓轩, 罗春苗, 陈鲲鹏.考虑三维弯曲的柔性立管疲劳快速计算方法[J].海洋工程,2025,(6):38~49 |
| 考虑三维弯曲的柔性立管疲劳快速计算方法 |
| Fast calculation method for fatigue of flexible riser considering three-dimensional bending |
| 投稿时间：2024-09-17 |
| DOI：10.16483/j.issn.1005-9865.2025.06.004 |
| 中文关键词: 柔性立管 疲劳损伤 截面力学 总体动力响应 设计冗余 |
| 英文关键词:flexible riser fatigue damage sectional mechanics global dynamic response design redundancy |
| 基金项目:科技部重点研发计划青年科学家项目（2023YFC2811600） |
| 作者 | 单位 | | 杜长江1,2, 张萌萌1,2, 付世晓1,2, 孟宇3, 崔晓轩3, 罗春苗1,2, 陈鲲鹏1,2 | 1.上海交通大学 海洋工程全国重点实验室，上海 200240
2.上海交通大学 船舶海洋与建筑工程学院，上海 200240
3.浙江恒安泰石油工程有限责任公司，浙江 舟山 316000 |
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| 中文摘要: |
| 非黏结动态柔性立管截面形式复杂、服役海况恶劣，疲劳破坏是其最难准确评估的失效模式之一。目前实际工程应用中主要依赖的疲劳评估方法是数值方法，然而传统的方法通常难以兼顾计算的精度与效率。为解决这一问题，聚焦于立管疲劳应力，基于截面力学理论和有限元模型开展了载荷-应力关系特性及应力分布特性研究；建立了考虑迟滞效应的柔性立管疲劳应力与三维弯曲载荷之间的非线性传递函数，通过与有限元分析软件BFLEX结果比较验证了传递函数的准确性；进一步基于线性损伤累积理论，形成了考虑三维弯曲的柔性立管疲劳快速计算方法，并与传统方法进行了对比。结果表明，该方法能够准确高效地计算疲劳应力，同时解决了传统疲劳分析方法过于保守的问题，避免了设计冗余，对工程实践有十分重要的指导意义。 |
| 英文摘要: |
| The unbonded dynamic flexible riser, characterized by a complex cross-sectional configuration and operating in harsh marine environments, is prone to fatigue failure—one of the most challenging failure modes to assess accurately. Numerical methods are primarily adopted in current engineering practice for fatigue evaluation, yet traditional approaches often struggle to balance computational accuracy and efficiency. To address this challenge, this study focuses on riser fatigue stress. Based on cross-sectional mechanics theory and a finite element model, the characteristics of the load-stress relationship and stress distribution are investigated. A nonlinear transfer function incorporating hysteresis effects between fatigue stress and three-dimensional bending loads is established, and its accuracy is validated through comparison with results from the finite element analysis software BFLEX. Furthermore, a rapid fatigue calculation method considering three-dimensional bending is developed using linear damage accumulation theory and is compared against traditional methods.Results indicate that the proposed method not only accurately and efficiently predicts fatigue stress but also mitigates the conservatism of conventional approaches, thereby avoiding excessive design redundancy and offering significant practical guidance. |
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