Flexural and Bond Behavior of Concrete Beams Strengthened with CFRP and Galvanized Steel Mesh Laminates
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 1
Abstract
Carbon fiber–reinforced polymer (CFRP) composites are effectively and predominantly used for flexure strengthening of RC beams. Recently, new emerging composite materials known as galvanized steel mesh (GSM) sheets, which are comprised of unidirectional ultrahigh-strength steel wire meshes, are gaining considerable attention in strengthening applications. The main aim of this paper is to compare the test results of RC beams strengthened with medium-density GSM (MSM) and high-density (HSM) laminates with that of CFRP laminates. Accordingly, a total of six RC beams were strengthened in flexure with equivalent CFRP, MSM, and HSM laminates, in addition to two control unstrengthened beam specimens. All beam specimens were subjected to symmetrical monotonic loading testing, and strain data were recorded along with deflection at the beams midspan. Experimental results showed that HSM laminates enhanced the flexural strength, stiffness, cracking performance, energy absorption, and ductility of RC beams compared with CFRP and MSM laminates. In addition, flexural bond tests were conducted on prism samples to compare the bond behavior between each of the three laminates and concrete interface. The test results also showed that HSM laminates failed at higher attained load levels than CFRP and MSM laminates. Current design guidelines were also used to predict the nominal flexural capacity of the control and strengthened RC beams. The results showed that the predicted ultimate load is in good agreement with the experimental results and the difference was in the range of , respectively. Therefore, it has been concluded that GSM laminates can be used as an effective composite material for flexural strengthening of RC beams.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was funded by Qatar National Research Fund under the National Priorities Research Program with Award No. NPRP 8-418-2-175. The statements made herein do not necessarily reflect the opinions of the Sponsor and are solely the responsibility of the authors. The authors are thankful to the Structural Technologies for providing and installing the CFRP sheets. Their help and support are highly appreciated. Also, a special thanks are given to Dr. Paolo Casadei for providing the galvanized steel mesh sheets.
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Practice Periodical on Structural Design and Construction
Volume 27 • Issue 1 • February 2022
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© 2021 American Society of Civil Engineers.
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Received: Mar 9, 2021
Accepted: Sep 16, 2021
Published online: Oct 23, 2021
Published in print: Feb 1, 2022
Discussion open until: Mar 23, 2022
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