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Sensors 2015, 15(1), 1060-1070; doi:10.3390/s150101060

A Sensor-Type PC Strand with an Embedded FBG Sensor for Monitoring Prestress Forces

Division of Structural Engineering Research/Korea Institute of Construction and Building Technology, 283, Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeonggi-do 411-712, Korea
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Received: 9 November 2014 / Accepted: 31 December 2014 / Published: 8 January 2015
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
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Abstract

Prestressed Concrete Wire and Strand (PC) strands are the most used materials to introduce prestress in a Pre-Stressed Concrete (PSC) structure. However, it is difficult to evaluate the final prestress force of the PC strand after prestressing or its residual prestress force after completion of the structure on site. This impossibility to assess eventual loss of prestress of the PC strand has resulted in a number of serious accidents and even in the collapse of several structures. This situation stresses the necessity to maintain the prestress force residual or after prestressing for the evaluation of the health of the concrete structure throughout its lifespan. Recently, several researchers have studied methods enabling one to verify the prestress force by inserting an optical fiber sensor inside the strand but failed to provide simple techniques for the fabrication of these devices to fulfill measurement performance from the design prestress to failure. Moreover, these methods require the additional installation of electrical resistance strain gages, displacement sensors and load cells on the outer surface of the structure for long-term precise measurement. This paper proposes a method enabling one to evaluate precisely and effectively the prestress force of the PC strand and intends to verify the applicability of the proposed method on actual concrete structures. To that end, an innovative PC strand is developed by embedding a Fiber Bragg Grating (FBG) sensor in the core wire of the PC strand so as to enable short term as well as long term monitoring. The measurement performance of the developed strand is then evaluated experimentally and the reliability of the monitoring data is assessed. View Full-Text
Keywords: PSC; strand; optical fiber sensor; FBG PSC; strand; optical fiber sensor; FBG
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kim, S.T.; Park, Y.; Park, S.Y.; Cho, K.; Cho, J.-R. A Sensor-Type PC Strand with an Embedded FBG Sensor for Monitoring Prestress Forces. Sensors 2015, 15, 1060-1070.

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