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首页> 外文期刊>Proceedings of the Institute of Marine Engineering, Science and Technology >Improved LJF equations for the uni-planar gapped K-type tubular joints of ageing fixed steel offshore platforms
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Improved LJF equations for the uni-planar gapped K-type tubular joints of ageing fixed steel offshore platforms

机译：老化的固定钢海上平台单平面间隙K型管接头的改进LJF方程

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The distribution of fixed steel offshore platforms around the world reveals a global fleet that has exceeded or is approaching the end of the design life of the facility. In many operating areas, there is an attraction to continue using these ageing facilities due to continued production or as an adjoining structure to facilitate a new field development or expansion. To justify continued life extension of the fixed platform, various integrity assessment techniques are often used. One of the major techniques used is based on the phenomenon of local joint flexibility (LJF). While the phenomenon of LJF has been well known in the offshore industry since the early 1980s, there has been little experimental data available. In 1983, Amoco conducted an experimental study primarily to determine stress concentration factors associated with gapped K-type steel tubular joints. The LJFs calculated were based on the effects of in-plane bending, out-of-plane bending and axial compression and tension. The derivations of the existing LJF equations have evolved in many ways including use of finite element (FE) methods to predict the joint behavior. There has been no benchmarking exercise to large-scale experimental data. This paper provides an improvement on existing LJF equations by benchmarking the Amoco K-joints test results to a FE model and through a detailed parametric study. Improved formulations are provided for local joint flexibilities for gapped uni-planar K-type tubular steel joints.
机译：固定钢海上平台在全球范围内的分布表明，全球船队已经超过或接近该设施的设计寿命。在许多作业区域中，由于持续的生产或作为促进新油田开发或扩展的附属结构，继续使用这些老化设施具有吸引力。为了证明固定平台的持续使用寿命是合理的，经常使用各种完整性评估技术。使用的主要技术之一是基于局部关节柔韧性（LJF）的现象。自1980年代初以来，LJF现象已在海上工业中广为人知，但几乎没有可用的实验数据。 1983年，Amoco进行了一项实验研究，主要是确定与间隙K型钢管接头有关的应力集中系数。计算的LJF基于平面内弯曲，平面外弯曲以及轴向压缩和拉伸的影响。现有LJF方程的推导已经以多种方式发展，包括使用有限元（FE）方法来预测接头行为。尚未对大型实验数据进行基准测试。本文通过将Amoco K接头测试结果基准化为有限元模型并通过详细的参数研究，对现有LJF方程进行了改进。提供了改进的配方，用于带间隙的单平面K型管状钢接头的局部接头柔韧性。

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