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首页> 外文期刊>Australian Journal of Mechanical Engineering >Reducing conservatism in free spanning pipeline vortex-induced vibration fatigue analysis
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Reducing conservatism in free spanning pipeline vortex-induced vibration fatigue analysis

机译：自由跨度管道涡激振动疲劳分析中的保守性降低

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This paper is concerned with the problem encountered in submarine pipeline design and maintenance where a loss of contact with the seabed has occurred. This is commonly referred to as a free span, and is where susceptibility to vortex-induced vibration (VIV) in long unsupported sections may ultimately lead to fatigue failure of the pipeline. Free span assessment has traditionally been performed in deterministic form, where uncertainties are accounted for in partial safety factors. However, traditional assessment is believed to be overly conservative (Hagen et al, 2003) due to the generalised and wide range of design conditions accounted for in the calibration of the safety factors. Excessive conservatism overestimates the threat to pipeline integrity, and leads to unnecessary capital and operating expenditure in free span control and intervention work. Probabilistic analysis of a typical free spanning pipeline, within a Norwegian deep-water development area, is presented in this paper. The computational model employed utilised a Monte Carlo approach based on recommended practice DNV-RP-F105 (DNV, 2006) to ensure a conceptually sound analysis. The deterministic treatment of a bilinear S-N fatigue curve, which retains the conservatism inherent in representation of the experimental data, differentiates this probabilistic analysis from those undertaken previously. In addition, an alternative limit state for cross-flow VIV is proposed where the focus is on the maximum response amplitude. The study produced evidence consistent with the proposition that traditional free span assessments are overly conservative. Specifically, in comparison, the probabilistic analysis allowed the free span length to increase by approximately 5-6 m. Acceptance of the methodology presented in this paper has potential benefit regarding free span intervention and the associated significant costs that can be avoided in cases that would otherwise proceed under the traditional deterministic form of assessment.
机译：本文涉及海底管道设计和维护中遇到的与海床失去接触的问题。这通常被称为自由跨度，并且在该区域中较长的无支撑段中易受涡流诱发振动（VIV）的影响，最终可能导致管道疲劳失效。传统上，自由跨度评估是以确定性形式进行的，其中不确定性是部分安全因素引起的。但是，由于对安全系数进行标定的设计条件的广泛性和广泛性，传统评估被认为过于保守（Hagen等，2003）。过度的保守主义高估了对管道完整性的威胁，并导致自由跨度控制和干预工作中不必要的资金和运营支出。本文介绍了在挪威深水开发区内典型的自由跨接管道的概率分析。所采用的计算模型基于推荐实践DNV-RP-F105（DNV，2006年），采用了蒙特卡洛方法，以确保从概念上进行合理的分析。对双线性S-N疲劳曲线的确定性处理保留了实验数据表示中固有的保守性，从而使这种概率分析与先前进行的分析有所不同。另外，提出了一种针对交叉流VIV的替代极限状态，其重点是最大响应幅度。该研究产生的证据与传统的自由跨度评估过于保守的主张相一致。具体而言，相比之下，概率分析允许自由跨度长度增加大约5-6 m。接受本文介绍的方法对于自由跨度干预及其相关的重大成本具有潜在的好处，在传统的确定性评估形式下，这些成本可以避免。

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