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http://dx.doi.org/10.12989/gae.2021.24.4.337

Performance monitoring of offshore PHC pipe pile using BOFDA-based distributed fiber optic sensing system  

Zheng, Xing (School of Earth Sciences and Engineering, Nanjing University)
Shi, Bin (School of Earth Sciences and Engineering, Nanjing University)
Zhu, Hong-Hu (School of Earth Sciences and Engineering, Nanjing University)
Zhang, Cheng-Cheng (School of Earth Sciences and Engineering, Nanjing University)
Wang, Xing (Nanjing University High-Tech Institute at Suzhou)
Sun, Meng-Ya (School of Earth Sciences and Engineering, Nanjing University)
Publication Information
Geomechanics and Engineering / v.24, no.4, 2021 , pp. 337-348 More about this Journal
Abstract
Brillouin Optical Frequency Domain Analysis (BOFDA) is a distributed fiber optic sensing (DFOS) technique that has unique advantages for performance monitoring of piles. However, the complicated production process and harsh operating environment of offshore PHC pipe piles make it difficult to apply this method to pile load testing. In this study, sensing cables were successfully pre-installed into an offshore PHC pipe pile directly for the first time and the BOFDA technique was used for in-situ monitoring of the pile under axial load. High-resolution strain and internal force distributions along the pile were obtained by the BOFDA sensing system. A finite element analysis incorporating the Degradation and Hardening Hyperbolic Model (DHHM) was carried out to evaluate and predict the performance of the pile, which provides an improved insight into the offshore pile-soil interaction mechanism.
Keywords
PHC pipe pile; Brillouin Optical Frequency Domain Analysis (BOFDA); offshore engineering; distributed fiber optic sensing (DFOS); load transfer analysis;
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