| Nonlinear Static Finite Element Stress Analysis of Pipe-in-Pipe Risers |
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| 作者姓名： | 周宏杰 闫澍旺 崔溦 |
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| 作者单位： | SchoolofConstructionEgnineering,TianjinUniversity,Tianjin300072,China |
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| 摘 要： | Owing to the complexity of the pipe-in-pipe (PIP) riser system in structure, load and restraint, many problems arise in the structural analysis of the system. This paper presents a new method for nonlinear static finite element stress analysis of the PIP riser system. The finite element (FE) model of the PIP riser system is built via software AutoPIPE 6.1. According to the specialties of a variety of components in the PIP riser system, different elements are used so as to model the system accurately. Allowing for the complication in modeling the effects of seabed restraint, a technique based on the bilinear spring concept is developed to calculate the soil properties. Then, based on a pipeline project, the entire procedure of stress analysis is discussed in detail, including creation of an FE model, processing of input data and analysis of results. A wide range of loading schemes is investigated to ascertain that the stresses remain within the acceptable range of the pipe material strength. Finally, the effects of the location of flanges, the thermal expansion of submarine pipelines and the seabed restraint on stress distribution in the riser and expansion loop are studied, which are valuable for pipeline designers.
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| 关 键 词： | 非线性 静态有限元法 管道气门 PIP 管道石油反应 |
Nonlinear Static Finite Element Stress Analysis of Pipe-in-Pipe Risers |
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| ZHOU Hong-jie ,YAN Shu-wang and CUI Wei School of Construction Engineering,Tianjin University,Tianjin ,China.Nonlinear Static Finite Element Stress Analysis of Pipe-in-Pipe Risers[J].China Ocean Engineering,2005,19(1):155-166. |
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| Authors: | ZHOU Hong-jie YAN Shu-wang and CUI Wei School of Construction Engineering Tianjin University Tianjin China |
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| Institution: | ZHOU Hong-jie 1,YAN Shu-wang and CUI Wei School of Construction Engineering,Tianjin University,Tianjin 300072,China |
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| Abstract: | Owing to the complexity of the pipe-in-pipe (PIP) riser system in structure, load and restraint, many problems arise in the structural analysis of the system. This paper presents a new method for nonlinear static finite element stress analysis of the PIP riser system. The finite element (FE) model of the PIP riser system is built via software AutoPIPE 6.1. According to the specialties of a variety of components in the PIP riser system, different elements are used so as to model the system accurately. Allowing for the complication in modeling the effects of seabed restraint, a technique based on the bilinear spring concept is developed to calculate the soil properties. Then, based on a pipeline project, the entire procedure of stress analysis is discussed in detail, including creation of an FE model, processing of input data and analysis of results. A wide range of loading schemes is investigated to ascertain that the stresses remain within the acceptable range of the pipe material strength. Finally, the effects of the location of flanges, the thermal expansion of submarine pipelines and the seabed restraint on stress distribution in the riser and expansion loop are studied, which are valuable for pipeline designers. |
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| Keywords: | pipe-in-pipe stress analysis pipe-soil interaction riser FE |
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