| 非对称局部壁厚减薄海底管道的屈曲分析 |
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| 引用本文： | 武行,赵海盛,李昕.非对称局部壁厚减薄海底管道的屈曲分析[J].海洋工程,2021,39(3):72-82. |
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| 作者姓名： | 武行 赵海盛 李昕 |
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| 作者单位： | 大连理工大学 海岸和近海工程国家重点实验室, 辽宁 大连 116024 |
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| 基金项目： | 国家重点研发计划重点专项（2016YFC0802301） |
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| 摘 要： | 在深海环境中，海底管线不仅承受较高外压，还会因为海水及运输介质的常年侵蚀而形成腐蚀缺陷，而腐蚀缺陷往往会导致管道的外压承载力下降。基于壳体稳定性理论，建立了含有非对称局部壁厚减薄管道在外压作用下的屈曲压力理论公式。公式具有广泛的适用性，当内、外局部壁厚减薄深度相等时，可用于计算含有对称局部壁厚减薄管道屈曲压力，而当内部或外部缺陷深度为零时，便可用于计算只含外部或者内部腐蚀缺陷的管道屈曲压力。通过有限元分析验证了该公式的正确性，结果表明公式可以准确预测不同缺陷位置及尺寸时管道的屈曲压力。详细研究了局部壁厚减薄缺陷位置、长度和深度等参数对屈曲压力的影响。研究表明，局部腐蚀对管道的屈曲压力产生重要影响，尤其当腐蚀角度和深度较大时，在腐蚀形成初期就会造成管道的承载力急剧下降，并且管道的屈曲压力与缺陷的径向位置有关，腐蚀缺陷位于管道外侧时的屈曲压力明显大于其位于管道内侧时的屈曲压力。
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| 关 键 词： | 海底管道 屈曲分析 外压 腐蚀缺陷 非对称 |
| 收稿时间： | 2020/6/14 0:00:00 |
Buckling analysis of pipes with asymmetric local wall thinning |
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| WU Hang,ZHAO Haisheng,LI Xin.Buckling analysis of pipes with asymmetric local wall thinning[J].Ocean Engineering,2021,39(3):72-82. |
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| Authors: | WU Hang ZHAO Haisheng LI Xin |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | In the deep-sea environment, submarine pipelines not only bear high external pressure, but also suffer from corrosion defects due to the erosion of seawater and transportation medium. The corrosion defects in the pipe often lead to the decrease of the external pressure bearing capacity. Based on the shell stability theory, a theoretical formula for the buckling pressure evaluation in a pipe with an asymmetric local wall thinning under external pressure is developed in this study. The proposed formula has a wide applicability. By setting the internal and external local wall thinning depths equal, the formula can be used to calculate the buckling pressure of the pipe with symmetrical local wall thinning, and it can also be used for the buckling analysis of the pipe containing only an external or internal corrosion defect by making the internal or external defect depth being zero. Then, finite element analysis is carried out to verify the accuracy of the proposed formula, and a good agreement between one another is observed. The effects of various parameters, viz. corrosion defect position, defect length and depth, on the critical buckling pressure are investigated in detail. Local corrosion has an important effect on the buckling pressure of the pipe, resulting in a sharp decline in the bearing capacity at the early stage of corrosion formation, especially when the corrosion angle and depth are large. Moreover, the buckling pressure of the pipe is affected by the radial position of the corrosion defect. When the corrosion defect is located at the external surface of the pipe, the buckling pressure is greater than the one for the defect located at the internal surface. |
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| Keywords: | offshore pipeline buckling analysis external pressure corrosion defect asymmetry |
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