Shear strengthening of sub-standard reinforced concrete beams with CFRP: Influence of fiber areal weight, wrap scheme and concrete strength

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dc.contributor.authorAlav, Deniz Sari
dc.contributor.authorUysal, Yusuf
dc.contributor.authorAksoylu, Ceyhun
dc.contributor.authorArslan, Musa Hakan
dc.date.accessioned2026-02-03T12:02:43Z
dc.date.available2026-02-03T12:02:43Z
dc.date.issued2025
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThis study investigates the effectiveness of carbon fiber-reinforced polymer (CFRP) in enhancing the performance of reinforced concrete beams with insufficient shear reinforcement-a common issue in existing low- and highstrength reinforced concrete buildings. A total of 35 one-third scale beams were tested under four-point bending, considering varying concrete strengths (5-70 MPa), CFRP areal weights (300 and 900 g/m2), and wrapping configurations (full (F), U-shaped (U), and side (S)). Key parameters such as load-displacement behavior, energy dissipation, ductility, and stiffness were analyzed in detail. The results demonstrated that CFRP strengthening increased shear capacity by up to 154 % in low-strength concrete (5-20 MPa), while the improvement was limited to 47.2 % in high-strength concrete. Failure modes were significantly influenced by wrapping type: full wrapping led to a 90 % shift from shear to flexural failure, whereas U-shaped and side wrapping achieved only 40 % and 10 % conversion, respectively. Full wrapping also yielded the highest gains in energy dissipation and ductility, while side wrapping alone was largely ineffective. Interestingly, increasing CFRP areal weight did not result in proportional performance gains; in many cases, the 300 g/m2 application outperformed the 900 g/m2 variant. This suggests that poor interfacial bonding and inadequate epoxy impregnation may hinder the effectiveness of higher areal weight configurations. In conclusion, concrete strength, wrapping type, and CFRP areal weight must be considered collectively in shear strengthening strategies. Among these, full wrapping offers the most consistent and reliable improvements in shear capacity, ductility. and energy dissipation.
dc.description.sponsorshipScientific Research Projects Unit of Konya Technical University [211004041]
dc.description.sponsorshipThis study was prepared by using the master thesis of Deniz SARI ALAV. The study was also supported by the Scientific Research Projects Unit of Konya Technical University under project number 211004041. The opinions expressed in this paper are those of the authors and do not reflect the views of the sponsor.
dc.identifier.doi10.1016/j.istruc.2025.110734
dc.identifier.issn2352-0124
dc.identifier.scopus2-s2.0-105025525821
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.istruc.2025.110734
dc.identifier.urihttps://hdl.handle.net/20.500.12428/34841
dc.identifier.volume82
dc.identifier.wosWOS:001630796500002
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Inc
dc.relation.ispartofStructures
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20260130
dc.subjectCFRP strengthening
dc.subjectWrap configuration
dc.subjectExperimental study
dc.subjectConcrete strength
dc.subjectReinforced concrete beams
dc.titleShear strengthening of sub-standard reinforced concrete beams with CFRP: Influence of fiber areal weight, wrap scheme and concrete strength
dc.typeArticle

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