TY - JOUR
T1 - Novel Embedded FRP Anchor for RC Beams Strengthened in Flexure with NSM FRP Bars
T2 - Concept and Behavior
AU - Ke, Y.
AU - Zhang, S. S.
AU - Smith, S. T.
AU - Yu, T.
N1 - Funding Information:
The authors are grateful for the financial support received from the National Natural Science Foundation of China (Project No. 51878310). The authors are also grateful to Mr. Mateusz Jan Jedrzejko at Huazhong University of Science and Technology for his assistance with the testing.
Publisher Copyright:
© 2022 American Society of Civil Engineers.
PY - 2023/2/1
Y1 - 2023/2/1
N2 - The near-surface-mounted (NSM) fiber-reinforced polymer (FRP) strengthening technique for reinforced-concrete (RC) beams has attracted worldwide research attention and application in the past two decades. In spite of improved bond strength between the NSM FRP and concrete, compared with the externally bonded (EB) FRP method, premature debonding failure still occurs, and, hence, the efficiency of the NSM FRP intervention is limited. An intuitive means to enhance efficiency is to apply anchorage devices to the RC beam; however, the availability of viable anchorage is limited for NSM applications. A novel anchorage device is therefore presented in this paper, which is referred to as an embedded FRP anchor (EFA). The concept, manufacture, and installation of the EFAs were initially presented. The effectiveness of EFAs in NSM FRP-strengthened RC beams was then ascertained through full-scale beam tests and comparison with an NSM FRP-strengthened beam anchored with a U-jacket. Moreover, the effects of EFA parameters on the behavior of anchored beam were also investigated. The test results not only prove the high anchoring efficiency of EFA but also reveal the significant effects of EFA parameters on the failure mode, load-deflection response, and NSM FRP strain of the EFA anchored beam.
AB - The near-surface-mounted (NSM) fiber-reinforced polymer (FRP) strengthening technique for reinforced-concrete (RC) beams has attracted worldwide research attention and application in the past two decades. In spite of improved bond strength between the NSM FRP and concrete, compared with the externally bonded (EB) FRP method, premature debonding failure still occurs, and, hence, the efficiency of the NSM FRP intervention is limited. An intuitive means to enhance efficiency is to apply anchorage devices to the RC beam; however, the availability of viable anchorage is limited for NSM applications. A novel anchorage device is therefore presented in this paper, which is referred to as an embedded FRP anchor (EFA). The concept, manufacture, and installation of the EFAs were initially presented. The effectiveness of EFAs in NSM FRP-strengthened RC beams was then ascertained through full-scale beam tests and comparison with an NSM FRP-strengthened beam anchored with a U-jacket. Moreover, the effects of EFA parameters on the behavior of anchored beam were also investigated. The test results not only prove the high anchoring efficiency of EFA but also reveal the significant effects of EFA parameters on the failure mode, load-deflection response, and NSM FRP strain of the EFA anchored beam.
KW - Debonding
KW - Embedded FRP anchor (EFA)
KW - Fiber-reinforced polymer (FRP)
KW - Flexural strengthening
KW - Near-surface mounted (NSM)
KW - Reinforced concrete (RC)
UR - http://www.scopus.com/inward/record.url?scp=85142212851&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0001279
DO - 10.1061/(ASCE)CC.1943-5614.0001279
M3 - Journal article
AN - SCOPUS:85142212851
SN - 1090-0268
VL - 27
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
IS - 1
M1 - 04022093
ER -