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Indexed by:会议论文

Date of Publication:2015-01-01

Abstract:The work presented in this article pertained to the development of a methodology for assessing the lateral buckling for subsea pipelines with distributed strain measurements. The buckling in subsea pipelines have to be taken seriously because they can overstress the pipe wall or lead to the stiffness failure due to the large deflection. This firms the importance of monitoring the occurrence and evolution of pipeline buckling during the life-cycle service. The present work involved in using distributed sensor to detect the lateral buckling and to assess the buckling deformation with the distributed strain measurements for subsea pipelines. According to the theoretical formulations, the sensing scheme is proposed as that the longitudinal strains are monitored by mounting the Brillouin optical time domain analysis (BOTDA) distributed sensors on the outer surface of the pipeline. Then the bending-induced strain is extracted to detect the occurrence and evolution of lateral buckling. An algorithm is proposed to calculating the lateral deformation of the buckle by using the bending-induced strains. Feasibility of the method was validated by using an experimental program on a small scale model pipe. The results demonstrate that the proposed approach is able to detect the onset of buckling and to assess the buckling deformation in the pipe. The methodology developed in this study provides a promising tool for assessing the structural integrity of subsea pipelines. ? 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved.