在役海底管道剩余强度评估方法研究

发布时间：2018-06-09 19:54

本文选题：海底管道 + 腐蚀缺陷　；参考：《天津大学》2014年硕士论文

【摘要】：随着海底管道在役年限的增长,管道的腐蚀现象日益严重,从而导致其壁厚减薄,剩余强度和最大安全承压能力降低,管道失效的可能性不断增大。为确保管道的安全生产作业,有必要根据管道的检测数据,对管道进行剩余强度评估和安全性校核以指导管道的生产作业、维护维修乃至更换。目前国内外有多种针对管道剩余强度的评估方法,常见的有按照国际通用规范评估、有限元评估、可靠性分析等方法。各种方法其理论基础、适用范围和结果保守性、精度都不尽相同。本文首先研究了两种国际通用的腐蚀管道剩余强度评估规范:ASME B31G评估标准和DNV-RP-F101规范,对两种规范的理论基础、适用条件和具体评估步骤做了详细的研究和分析,并针对某一具体工程实例进行了剩余强度校核。研究有限元分析管道剩余强度的基本方法。本文基于弹塑性力学理论,利用ABAQUS有限元软件对管道建立有限元模型,进行非线性有限元分析,并重点对建模和加载过程中的关键性问题进行讨论分析,得到了较为优化和合理的建模和加载方法。根据研究所得建模加载方法,针对工程实例建立腐蚀管道三维实体模型,计算管道剩余强度。结合以上三种评估方法的原理,对比不同方法下工程实例管道的计算结果,得到三种方法在适用范围、操作难易程度以及结果保守性和精度等方面的差异,为在役海底管道剩余强度的评估提供指导。
[Abstract]:With the increase of the service life of the submarine pipeline, the corrosion phenomenon of the pipeline becomes more and more serious, which leads to the thinning of the wall thickness, the decrease of the residual strength and the maximum safe bearing capacity, and the increasing possibility of pipeline failure. In order to ensure the safe operation of pipeline, it is necessary to evaluate the residual strength and check the safety of pipeline according to the inspection data of pipeline, so as to guide the production, maintenance and even replacement of pipeline. At present, there are a variety of evaluation methods for residual strength of pipeline at home and abroad, such as evaluation according to international general specification, finite element evaluation, reliability analysis and so on. The theoretical basis, application range and result conservatism of various methods are different. In this paper, two kinds of international standards for evaluating residual strength of corroded pipelines are studied, namely, the W ASME B31G evaluation standard and the DNV-RP-F101 code. The theoretical basis, applicable conditions and concrete assessment steps of the two specifications are studied and analyzed in detail. At the same time, the residual strength of a concrete project is checked. The basic method of finite element analysis for residual strength of pipeline is studied. Based on the theory of elastic-plastic mechanics, the finite element model of pipeline is established by Abaqus finite element software, and the nonlinear finite element analysis is carried out, and the key problems in modeling and loading are discussed and analyzed. A more optimized and reasonable method of modeling and loading is obtained. According to the method of modeling and loading, the three-dimensional solid model of corroded pipeline is established for engineering example, and the residual strength of pipeline is calculated. Combined with the principles of the above three evaluation methods, by comparing the calculation results of engineering examples with different methods, the differences of the three methods in terms of applicability, operation difficulty, conservatism and accuracy of the results are obtained. To provide guidance for the evaluation of the remaining strength of existing submarine pipelines.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.2

【参考文献】