Abstract
In reinforced concrete (RC) structures, a proper bond between the reinforcement and the concrete is key for an appropriate composite action. To-date limited studies exist that evaluate the bond of fiber reinforced polymer (FRP) bars in concrete members under flexure and its effect on the development length required to ensure a full stress transfer. In this paper, the bond strength developed by glass FRP (GFRP) and steel rebars is evaluated and compared by testing 16 RC beams under three-point-bending. The beams were 1.83 m long and had a section of 150 x 360 mm. Different embedment lengths were evaluated as a function of the bar diameter (db): 30 db, 40 db, and 50 db for GFRP reinforced specimens, and 20 db, and 30 db for steel reinforced beams. Two different GFRP rebar types (six beams for each) and conventional steel (four beams) were used as reinforcement; all the rebars had a nominal diameter of 12.7 mm. Based on the results presented herein, GFRP rebars have a lower bond capacity than steel rebars. Also, the development lengths as suggested by actual code provisions for GFRP rebars (ACI 440.1R-15) appear to be over-conservative: the theoretical development length values were around 110% - 188% higher than the experimental results for the tested GFRP rebars, while the predicted development length for steel rebars according to ACI 318 was about 83% higher than the experimental results.
Original language | English |
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Title of host publication | Development and Applications of FRP Reinforcements, DA-FRPR 2021 |
Editors | Radhouane Masmoudi |
Publisher | American Concrete Institute |
Pages | 61-71 |
Number of pages | 11 |
ISBN (Electronic) | 9781641951951 |
Publication status | Published - 21 Oct 2022 |
Externally published | Yes |
Event | Development and Applications of FRP Reinforcements, DA-FRPR 2021 - ACI Virtual Concrete Convention 2021 - Virtual, Online, USA United States Duration: 17 Oct 2021 → 21 Oct 2021 |
Publication series
Name | American Concrete Institute, ACI Special Publication |
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Volume | SP-356 |
ISSN (Print) | 0193-2527 |
Conference
Conference | Development and Applications of FRP Reinforcements, DA-FRPR 2021 - ACI Virtual Concrete Convention 2021 |
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Country/Territory | USA United States |
City | Virtual, Online |
Period | 17/10/21 → 21/10/21 |
Funding
ACI member Alvaro Ruiz Emparanza, Ph.D. is the Director of Engineering and Business Development of Mafic USA, LLC. He graduated with a Ph.D. in Civil Engineering from the University of Miami. His research interests included the durability assessment of alternative reinforcing systems for concrete structures, such as, fiber reinforced polymer (FRP) rebars, and the structural performance of reinforced concrete structures reinforced with FRP. During his academic career, he has been awarded with multiple fellowship and scholarships, including the President’s Fellowship Award by the American Concrete Institute (ACI) Foundation. He is Chair of the committee S-805 and active member of various committees: Development, SYPAC, S-806, 440, 440-H, and 440-K. Prior to pursuing his PhD, he did his bachelor’s in civil engineering at the University of the Basque Country (San Sebastian, Spain) and his masters, also in civil engineering, at the University of Applied Science Fachhochshule Muenster (Muenster, Germany). He graduated with honors from both programs.
Keywords
- bond
- composites
- development length
- flexure
- GFRP
- sustainability
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science