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Structural Engineering and Mechanics
  Volume 65, Number 2, January25 2018 , pages 155-162

On strain measurement of smart GFRP bars with built-in fiber Bragg grating sensor
Minkwan Ju, Kyoungsoo Park, Doyoung Moon, Cheolwoo Park and Jongsung Sim

    A smart glass fiber reinforced polymer (SMFRP) reinforcing bar with a fiber Bragg grating (FBG) sensor was fabricated using a pultrusion technique, while ribs were formed to improve bonding between concrete and SMFRP. Then, strain of SMFRP bars were measured for a uniaxial tension test of an SMFRP bar, and a four-point bending test of concrete beams reinforced with SMFRP bars. The results of a uniaxial tension test illustrate that the strain obtained from an FBG sensor agrees well with that obtained from electrical resistance strain gauge (ERSG). Additionally, concrete beams reinforced with SMFRP bars were fabricated, and actual flexural test were performed while the strain of with an FBG sensor was compared with that of ERSG. The experimental results demonstrate that SMFRP bars can be used as reinforcement of concrete member while providing deformation information. Furthermore, SMFRP bars may provide stronger durability and smart monitoring to reinforced concrete members under corrosive environments during a service life.
Key Words
    SMFRP bar; fiber Bragg grating (FBG) sensor; strain, reinforced concrete; four point bending test
Minkwan Ju and Kyoungsoo Park: Department of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
Doyoung Moon: Department of Civil Engineering, Kyungsung University, 309 Sooyoung-ro, Nam-gu, Busan, 48434, Republic of Korea
Cheolwoo Park: Department of Civil Engineering, Kangwon National University, 1 Joongang-ro, Samcheok-si, Kangwon, 25913, Republic of Korea
Jongsung Sim:Department of Civil and Environmental Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do,15588, Republic of Korea

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