Evaluation of Reinforced Concrete T-Beams Retrofitted in Shear with Mechanically Anchored Dry Carbon Fiber Sheets

Externally bonded fiber-reinforced polymer (FRP) composites are commonly used to retrofit concrete beams in shear. However, debonding failure limits the effectiveness of such a system. Mechanically anchored systems eliminate the debonding mode of failure, which maximizes the effectiveness of the ret...

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Bibliographic Details
Published in:Experimental techniques (Westport, Conn.) Conn.), 2022, Vol.46 (4), p.647-660
Main Authors: El-Tahan, M., Hassanein, A., Megid, W. A., Galal, K.
Format: Article
Language:English
Subjects:
Acoustic emission testing
Carbon fiber reinforced plastics
Carbon fibers
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crack initiation
Damage
Debonding
Failure
Fiber reinforced concretes
Fiber reinforced polymers
Flaw detection
Fracture mechanics
Materials Science
Pollution monitoring
Polymer matrix composites
Reinforced concrete
Research Paper
Retrofitting
Shear
Sheets
System effectiveness
T beams
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Summary:Externally bonded fiber-reinforced polymer (FRP) composites are commonly used to retrofit concrete beams in shear. However, debonding failure limits the effectiveness of such a system. Mechanically anchored systems eliminate the debonding mode of failure, which maximizes the effectiveness of the retrofit system. This study investigates the effectiveness of using a modified mechanical anchor to strengthen concrete T-beams in shear. The fabrication and design details of this system are discussed. Three reinforced concrete (RC) T-beams were tested up to failure under a four-point bending test to assess the effectiveness of the proposed retrofit system. One beam was tested as a control beam, while two beams were strengthened in shear using mechanically anchored dry carbon fiber (CF) sheets. The tested beams were instrumented with conventional instruments to monitor the load, strain, displacement, and acoustic sensors to monitor the damage initiation, progression, and location. The modified mechanical anchor retrofit system increased the shear capacity by up to 22 %. The acoustic emissions (AE) monitoring of the tested T-beams was able to detect the locations of the cracks that caused the failure of the beams.
ISSN:0732-8818
1747-1567
DOI:10.1007/s40799-021-00497-7