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Sensors (Basel). 2017 Aug 10;17(8). pii: E1843. doi: 10.3390/s17081843.

Construction Condition and Damage Monitoring of Post-Tensioned PSC Girders Using Embedded Sensors.

Author information

1
Department of Civil Engineering, Chungnam National University, Daejeon 34134, Korea. kjshin@cnu.ac.kr.
2
Department of NPP Engineering, KEPCO International Nuclear Graduate School, Ulsan 45014, Korea. sclee@kings.ac.kr.
3
Department of Civil Engineering, Chungnam National University, Daejeon 34134, Korea. yunkim@cnu.ac.kr.
4
Department of Marine and Civil Engineering, Chonnam National University, Yeosu 59626, Korea. jm4kim@jnu.ac.kr.
5
School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University, Suwon 16419, Korea. shparkpc@skku.edu.
6
Department of Civil Engineering, Pukyong National University, Busan 48513, Korea. hwanwoo@pknu.ac.kr.

Abstract

The potential for monitoring the construction of post-tensioned concrete beams and detecting damage to the beams under loading conditions was investigated through an experimental program. First, embedded sensors were investigated that could measure pre-stress from the fabrication process to a failure condition. Four types of sensors were installed on a steel frame, and the applicability and the accuracy of these sensors were tested while pre-stress was applied to a tendon in the steel frame. As a result, a tri-sensor loading plate and a Fiber Bragg Grating (FBG) sensor were selected as possible candidates. With those sensors, two pre-stressed concrete flexural beams were fabricated and tested. The pre-stress of the tendons was monitored during the construction and loading processes. Through the test, it was proven that the variation in thepre-stress had been successfully monitored throughout the construction process. The losses of pre-stress that occurred during a jacking and storage process, even those which occurred inside the concrete, were measured successfully. The results of the loading test showed that tendon stress and strain within the pure span significantly increased, while the stress in areas near the anchors was almost constant. These results prove that FBG sensors installed in a middle section can be used to monitor the strain within, and the damage to pre-stressed concrete beams.

KEYWORDS:

damage; load cell; monitoring; optical fiber sensor; pre-stress; pre-stressed concrete

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