基于分布式光纤传感的海底管线横向屈曲识别方法  

Recognition Method of Lateral Buckling of Submarine Pipeline Based on Distributed Optical Fiber Sensing

作　　者：吴文婧 冯新 WU Wenjing;FENG Xin(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian116024,Liaoning,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212100 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《应用科学学报》2022年第5期779-789,共11页Journal of Applied Sciences

摘　　要：针对传统海底管线横向屈曲识别方法无法真实反映海底管线结构状态的问题,本文以含初始缺陷的海底管线作为研究对象,基于分布式光纤传感获得的海底管线分布式结构响应,采用Euler-Bernoulli梁挠曲线计算方法建立管道屈曲位移重构算法,实现了荷载未知情况下海底管线前、后屈曲行为的定量识别。以初始缺陷幅值作为变参数,采用初始缺陷海底管线有限元分析与模型实验验证提出方法的可行性。结果表明:本文基于分布式光纤传感提出的海底管线横向屈曲位移重构算法可定量识别海底管线横向屈曲的产生及发展过程,为解决未知荷载作用下海底管线横向屈曲识别问题提供了一种可行的方法。In view of the problem that the traditional subsea pipeline lateral buckling identification method cannot truly reflect the structural state of the subsea pipeline, this paper takes the subsea pipeline with initial defects as the research object, and uses the Euler-Bernoulli curve calculation method to obtain the distributed structural response of submarine pipelines based on distributed optical fiber sensing. The method establishes a pipeline buckling displacement reconstruction algorithm, and realizes the quantitative identification of the front and rear buckling behaviors of submarine pipelines under the condition of unknown loads. Taking the initial defect amplitude as variable parameter,the feasibility of the proposed method is verified by the finite element analysis and the model test of the initial defect submarine pipeline. Simulation results show that the reconstruction algorithm proposed in this paper can quantitatively identify the generation and development process of lateral buckling of submarine pipelines, and provide a feasible method for solving the problem of lateral buckling identification of submarine pipelines under unknown loads.

关 键 词：海底管线 横向屈曲 管道屈曲位移重构算法 Euler-Bernoulli梁挠曲线计算方法 静态布里渊光时域分析仪原理 

分 类 号：TU43[建筑科学—岩土工程]