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Research on structure state identification method of segmented pipeline based on distributed optical fiber sensing

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Abstract

In view of the bending failure problem of segmented buried pipelines under the condition of foundation soil settlement, this paper establishes a structural state identification method suitable for segmented buried pipelines based on distributed optical fiber sensing technology to study the structural response of segmented buried pipelines under the condition of foundation soil settlement. Based on the Ω-type bell-and-spigot joint monitoring unit, this study realizes the nondestructive monitoring of segmented pipeline structure response using distributed optical fiber sensing technology. The distributed optical fiber sensing system is used to monitor the bending strain curve of the pipe body under the action of foundation settlement based on Brillouin optical time-domain analysis (BOTDA) principle, the bending strain of the segmented buried pipeline body was determined. Through the parameter sensitivity analysis of the segmented buried pipeline-soil finite element model, it is determined that the vertical spring stiffness coefficient of the foundation soil is the main factor affecting the vertical displacement and bending strain of the segmented buried pipeline. Then, the vertical spring stiffness coefficient of the foundation soil is used as the correction term, and the bending strain monitoring value of the pipe body is used as the objective function to correct the finite element model of the segmented buried pipeline. Based on the revised pipeline finite element model, we obtain the real stiffness of the foundation soil, and invert the vertical displacement of the pipeline and the bending angle of the socket and socket of buried pipelines to realize structural status recognition for segmented buried pipelines. The effectiveness of the method is verified by full-scale experiments.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 52079024).

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Authors and Affiliations

  1. Jiangsu University of Science and Technology, Zhenjiang, 212000, Jiangsu, China

    Wenjing Wu & Guangzhi Xing

  2. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, China

    Xin Feng

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  1. Wenjing Wu
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  2. Guangzhi Xing
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  3. Xin Feng
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Correspondence to Wenjing Wu or Xin Feng.

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Wu, W., Xing, G. & Feng, X. Research on structure state identification method of segmented pipeline based on distributed optical fiber sensing. J Civil Struct Health Monit 14, 255–268 (2024). https://doi.org/10.1007/s13349-023-00719-z

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  • DOI: https://doi.org/10.1007/s13349-023-00719-z

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