| 浮体二阶运动下钢悬链式立管触地区动态响应分析 |
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| 引用本文： | 陈嘉明,白兴兰,杨风艳.浮体二阶运动下钢悬链式立管触地区动态响应分析[J].海洋工程,2022,40(6):133-141. |
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| 作者姓名： | 陈嘉明 白兴兰 杨风艳 |
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| 作者单位： | 浙江海洋大学 船舶与海运学院, 浙江 舟山 316022;浙江省近海海洋工程技术重点实验室, 浙江 舟山 316022;海洋石油工程(青岛)有限公司, 山东 青岛 266555 |
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| 基金项目： | 国家自然科学基金资助项目(52171279,51879238)；浙江省自然科学基金重点项目(LHZ21E090003)；舟山市科技计划项目(2021C21002) |
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| 摘 要： | 浮体运动是引起钢悬链式立管(steel catenary riser，简称SCR)动态响应和疲劳损伤的关键因素，目前研究SCR问题时，为简化计算往往仅考虑平台一阶运动，忽略二阶运动影响。而实际上不同浮体结构的二阶运动响应特征明显，拟以SCR服役张力腿平台(tension leg platform，简称TLP)为例，探讨浮体二阶运动对SCR触地区动态响应的影响。建立考虑海床刚度退化的管土作用模型以改进现有的CABLE3D RSI程序，通过编写程序接口，将有限元分析得到的平台实际运动响应导入，研究平台不同运动作用下SCR触地区的位移、动力响应及疲劳分布情况。根据波流作用方向将TLP二阶慢漂运动分为近端和远端漂移两种工况，发现二阶运动下立管与海床的作用范围会增大，且触地区不仅发生高频小幅振荡运动，同时伴随低频大幅运动响应；平台远端漂移时，管内张力敏感程度高，而近端漂移时触地区的弯矩显著增大，都会不同程度提高触地区的疲劳损伤率。研究可为服役不同浮体的SCR响应预测与疲劳分析提供参考和借鉴。
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| 关 键 词： | 钢悬链式立管 平台二阶运动 管土相互作用 触地区 动力响应 |
| 收稿时间： | 2022/1/19 0:00:00 |
Influence of offshore platform second-order motion on dynamic response in touchdown zone of steel catenary riser |
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| CHEN Jiaming,BAI Xinglan,YANG Fengyan.Influence of offshore platform second-order motion on dynamic response in touchdown zone of steel catenary riser[J].Ocean Engineering,2022,40(6):133-141. |
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| Authors: | CHEN Jiaming BAI Xinglan YANG Fengyan |
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| Institution: | School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China;Key Laboratory of Offshore Engineering Technology of Zhejiang Province, Zhoushan 316022, China; Offshore Petroleum Engineering(Qingdao) Co., Ltd., Qingdao 266555, China |
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| Abstract: | The dynamic response and fatigue damage of steel catenary riser (SCR) is mainly induced by floating body motion. At present, in order to simplify the calculation the first-order oscillation motion is mainly considered and the second-order motion is ignored in dynamic analysis of SCR. However, the second-order motion of different floating bodies has obvious features under deep-water environment. The influence of second-order motion of floating body on dynamic response in touchdown zone of SCR is investigated by taking the SCR and tension leg platform (TLP). The riser-soil interaction model considering stiffness degradation is established to improve the existing CABLE3D RSI program. By writing the program interface, the motion response of TLP is inputted to the analysis procedure of SCR to study the displacement, dynamic response and fatigue distribution in touchdown zone of SCR under different motions of the TLP. The second-order slow drift motion of TLP is divided into near and far drift through changing the direction of wave and current. The results show that the riser-soil interaction area increases with the second-order motion. The oscillation motion with small amplitudes and high frequencies and the motion with large amplitudes and low frequencies are induced simultaneously in touchdown zone because of the TLP second-order motion. Tension force of SCR is sensitive to far drift of TLP and the bending moment in touchdown zone increases significantly with near drift motion of TLP. Therefore, the fatigue damage rate will increase with the increase of stress amplitude which is induced by tension and bending moment. It can provide reference for response prediction and fatigue analysis of SCR with different floating platforms. |
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| Keywords: | steel catenary riser platform second-order motion riser-soil interaction touchdown zone dynamic response |
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