Strain Monitoring on PHC Pipe Piles Based on Fiber Bragg Grating Sensors
Publication: Journal of Performance of Constructed Facilities
Volume 33, Issue 2
Abstract
Fiber Bragg grating (FBG) sensors emerged as a relatively new strain-sensing technology for civil engineering applications. This study presents a field test to assess the feasibility of FBG sensors in monitoring the strain profile of prestressed high-strength concrete (PHC) pipe piles during installation. Two open-ended PHC pipe piles were instrumented with FBG sensors and then driven into the ground using a hydraulic jacking machine. To measure the strain profile along the test piles, nine FBG sensors were arranged in a single optical fiber and then mounted on one pile at the opposite side to monitor the strain at different levels as a function of wavelength shift. The procedure for installing the FBG sensors along the PHC pipe piles is introduced first. Next, the distribution of the axial forces and average side shear stresses that were evaluated from the strain measurements of the FBG sensors are discussed. The field test results indicate that the FBG sensor system was suitable for monitoring the strain state of PHC pipe piles during installation. The axial forces and side shear stresses along the test piles were influenced significantly by the penetration depth and the local soil resistance.
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Acknowledgments
The authors gratefully acknowledge that the work presented in this paper was supported by a grant from the National Natural Science Foundations of China (No. 51879246), and the Young Talent Program of Ocean University of China (No. 841712014).
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Published In
Journal of Performance of Constructed Facilities
Volume 33 • Issue 2 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 24, 2016
Accepted: Aug 31, 2018
Published online: Jan 7, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 7, 2019
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