学术论文

      椭圆度-凹坑双缺陷海底管道局部屈曲特性研究

      Local buckling study on subsea pipeline with ellipticity-denting defect

      摘要:
      海底管道在制造、埋设以及使用过程中极易产生椭圆度-凹坑双缺陷,双缺陷影响管道局部屈曲,对含椭圆度-凹坑双缺陷海底管道的局部屈曲特性研究十分必要.现行规范中采用等效椭圆度对含椭圆度-凹坑海底管道进行评估,该方法无法准确评估不同缺陷形式的屈曲特性.采用形状系数对含椭圆度-凹坑双缺陷的海底管道进行评估,运用有限元软件ABAQUS进行数值模拟,并进行试验验证.在此基础上对含有不同凹坑深度、不同椭圆度的海底管道进行局部屈曲的数值模拟,计算不同形状椭圆度、含有不同凹坑深度海底管道的形状系数,对其进行敏感性分析.计算结果表明:形状系数对海底管道椭圆度、凹坑深度、径厚比敏感性较强;对凹坑宽度敏感性较弱.
      Abstract:
      Ellipticity and denting easily occur in the manufacturing, burying and using of subsea pipelines, and double defects will influence the local buckling of subsea pipelines. Therefore, it is important to study the local buckling of subsea pipeline with ellipticity-denting defect. The assessment method for the subsea pipelines with ellipticity-denting defect in current codes uses equivalent ellipticity to describe the defect,but the method can't describe the buckling behavior of different defects. Coefficient of shape is used to describe the elliptical and denting defects with more accurate resutls. Finite element software ABAQUS is used to numerically simulate the local buckling of subsea pipelines with different ellipticities or denting depths to calculate the coefficient of shape,and to analyse the sensitivity of the coefficient of shape. The result shows that the coefficient of shape is sensitive to the ellipticity, denting depth and diameter-thickness ratio;and the width of denting doesn't influence a lot.
      作者: 薛陆丰 [1] 余杨 [1] 余建星 [1] 徐立新 [1] 高静坤 [2] 刘浩 [2]
      Author: XUE Lufeng [1] YU Yang [1] YU Jianxing [1] XU Lixin [1] GAO Jingkun [2] LIU Hao [2]
      作者单位: 天津大学 水利工程仿真与安全国家重点实验室,天津,300072 中海石油 深海开发有限公司,广东深圳,518000
      刊 名: 海洋工程 ISTICPKU
      年,卷(期): 2018, 36(2)
      分类号: P754
      在线出版日期: 2018年5月14日
      基金项目: 国家工信部高技术船舶科研项目"500米水深油田生产装备TLP自主研发",国家科技重大专项资助项目,国家自然科学基金青年基金资助项目