Experimental Investigations on Load Transfer of PHC Piles in Highway Foundation Using FBG Sensing Technology
Publication: International Journal of Geomechanics
Volume 17, Issue 6
Abstract
Pretensioned spun high-strength concrete (PHC) piles are increasingly used to improve highway foundations with large pile spacing and short pile length without splicing. In this paper, a series of field tests comprising cone penetration tests (CPTs), piling, and static pile load tests were performed to investigate the load transfer mechanism of such PHC piles, the load transfer mechanisms of which are different from that of long piles with splices used in structural foundations. The variation of axial strain along PHC piles was monitored during piling and load tests using fiber Bragg grating (FBG) sensing technology and conventional vibrating wire (VW) strain gauges. The results show the superiority of FBG sensing technology in terms of reliability of data and feasibility of measurement under fast changing axial strain. The experimental data also show significant variation in the shaft and tip resistance during piling and the pile-soil strength limit state of the load tests.
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Acknowledgments
This work is supported financially by the National Natural Science Foundation of China (Grant 41272327), the communications science and technology funding of the Department of Communications of Guangdong Province [Grant 2011(794)-02-021], the Natural Science Foundation of Jiangsu Province (Grant BK2011747), and Fundamental Research Funds for the Central Universities (Grants 2015B25514 and 2015B17214).
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 17 • Issue 6 • June 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 27, 2015
Accepted: Jul 29, 2016
Published online: Oct 18, 2016
Discussion open until: Mar 18, 2017
Published in print: Jun 1, 2017
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