| Research on Fatigue invalidation of A Submarine Pipeline Span Subjected to Waves and Currents |
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| 作者姓名： | 余建星 席兆胜 李鸿涛 |
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| 作者单位： | School of Civil Engineering Tianjin University，School of Civil Engineering Tianjin University，Offshore Engineering Plan Approval Center of China Classification Society，Tianjin 300072 China Tianjin 300072 China Tianjin 300457 China |
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| 摘 要： | 1 .IntroductionRecently, more and more importance is attached to the development of offshore oil and gas alloverthe world and many submarine pipelines have been laid.Submarine pipelines are the lifeline ofthe transportation of offshore oil and gas .Submar…
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| 关 键 词： | 海底管道 垂直振动 疲劳失效 随机过程 波浪 海流 |
| 收稿时间： | 2005-11-12 |
| 修稿时间： | 2006-08-10 |
Research on Fatigue Invalidation of A Submarine Pipeline Span Subjected to Waves and Currents |
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| YU Jian-xing,XI Zhao-scheng,LI Hong-tao.Research on Fatigue invalidation of A Submarine Pipeline Span Subjected to Waves and Currents[J].China Ocean Engineering,2006,20(4):595-604. |
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| Authors: | YU Jian-xing XI Zhao-scheng LI Hong-tao |
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| Abstract: | Considering both the axial force on the spanning pipeline and influence of sea waves and currents, a perpendicular nonlinear vibration equation which satisfies given boundary conditions is set up according to the factual soil supports for the pipeline. Based on the inherent modes of vibration determined from the equation of motion describing free vibrations, the differential equations for the time domain of the equation solution are deduced and established. By the application of time and frequency domain analysis, the sea wave and current force spectrum is derived from wave spectrum and is used as the input spectrum of the vibration equation to deduce the output spectrum, and further determine the probability distribution of displacement and strain. On this basis, the fatigue invalidation probability of the spanning pipeline is found out according to the theory of reliability. Finally, by means of calculation and analysis of a practical sample, the degree of effect of some important parameters on fatigue invalidation of the spanning pipeline span is determined. |
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| Keywords: | pipeline span perpendicular vibration stochastic process fatigue invalidation reliability |
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