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Research Article

Anchors for shear strengthening of damaged rc beam using bonded steel plate

Md Ashraful Alam, Mohammad Al-Amin

Department of Civil Engineering, University of Asia Pacific, Dhaka, Bangladesh



Reinforced concrete;

Damaged beam;

Shear strengthening;

EB method;

Steel plate;


Appropriate anchor system has very important role for effective retrofitting of structure specially to prevent debonding of bonded plate for shear strengthening of damaged reinforced concrete beam. The debonding happens at concrete interface of externally bonded (EB) plate due to lower interfacial bond strength. Proper anchor system would enhance interfacial strength to prevent debonding failure. The main aim of the research work was to investigate the effectiveness of various anchor systems for externally bonded steel plate to enhance shear strength of damaged RC beams. A total of five full scale reinforced concrete beam had been fabricated, all beams were fully damaged in shear before strengthening. The damaged beams were then strengthened for shear using steel plates with double connector, multiple connector, welded connector and near surface embedded bar anchor systems. Design guideline had been proposed to obtain dimension of steel plate for shear strengthening of damaged RC beam. Results exhibited that all anchors prevented debonding of steel plate at concrete-adhesive interface. Welded connector (WC) and embedded bar (EB) anchors had completely prevented debonding failures of steel plate at concrete-adhesive and plate-adhesive interfaces. Double and multiple connector anchors failed due to crushing of concrete at anchor zone followed by debonding of plate. Whereas, un-anchored strengthened beam showed premature debonding of plate at concrete-adhesive interface followed by shear failure. The results of the research exhibited that double and welded connector anchors had excellent performance in increasing shear strength to re-store original shear capacities of damaged beams. The theoretical results were comparable with the experimental findings.

© 2023 MIM Research Group. All rights reserved.


20/04/2024 Collaboration for HSTD-2024Editorial Board of our journal and Organizing Committee of the III. International Conference on High-Speed Transport Development (HSTD) have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.

20/04/2024 Collaboration for DSL2024-SS1Editorial Board of our journal and Organizing Committee of the DSL2024 Fluid Flow, Energy Transfer & Design (SS1) have agreed to collaborate. Extended versions of the selected papers from the session will be published in our journal. For more see Events. .

8/12/2023 Special Issue: Embark on a journey of innovation with the journal of Research on Engineering Structures and Materials as we unveil a compelling opportunity for contributors in our upcoming special issue, "Design, Analysis, and Manufacturing of Composite Vehicle Structures." Led by distinguished Guest Editors Liubov Gavva and Oleg Mitrofanov from Moscow Aviation Institute. For more info see the link.

(More details of the news may be given in the News section)

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2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.

2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.

2023 Most Cited Paper Award:

The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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