PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 811–819

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Strengthening of reinforced concrete (RC) structures via external bonded fiber-reinforced polymer (EB-FRP) systems has been widely documented and used. This form of retrofitting has proven to be effective in enhancing flexural and shear capacity of RC beams. However, it is limited due to premature debonding of the FRP laminates prior to utilizing the laminates strength, and typically results in brittle member failure. To overcome this issue, studies have shown that proper anchorage systems mitigate debonding and enables the achievement of higher strengthening levels. Out of the many anchorage systems researched, FRP splay anchors have proven to be effective in enhancing member’s capacity by delaying the laminates debonding. However, the literature is lacking adequate information on the effect of splay anchors on the performance externally strengthened RC beams in shear. Accordingly, five shear deficient RC T-beams specimens were cast and strengthened with CFRP U-wrapped laminates and anchored with CFRP anchors. The parameter investigated in this study is the anchor dowel diameter. Three dowel diameters were tested: 12 mm, 14 mm, and 16 mm. The performance of the anchored U-wrapped specimens in terms of failure modes, load deflection responses, shear strength, strain in CFRP laminates, and ductility is compared to that of unstrengthened and unanchored strengthened control specimens. Test results showed that CFRP anchors delayed debonding of the U-wraps, improved the shear strength of unanchored U-wraps, and significantly enhanced the ductility of the beam specimens. In addition, it was concluded that anchoring CFRP laminates with CFRP anchors highly utilized the strain attained in CFRP laminates. No clear trend was observed between anchor diameter and ultimate load-carrying capacity of the specimens. Based on the results of this study, anchor dowel diameter of 14 mm was found optimum for an anchor embedment depth of 85 mm. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: shear; reinforced concrete; T-beams; strengthening; CFRP; fiber-reinforced polymers; U-Wraps; FRP splay anchors. 1st Virtual European Conference on Fracture Shear strengthening of reinforced concrete T-beams using CFRP laminates anchored with bent CFRP splay anchors Haya H. Mhanna a , Rami A. Hawileh a,* , Jamal A. Abdalla a a Department of Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, United Arab Emirates Abstract Strengthening of reinforced concrete (RC) structures via external bonded fiber-reinforced polymer (EB-FRP) systems has been widely documented and used. This form of retrofitting h s proven t be effective i enhancing flexural and shear capacity of RC beams. However, it is limited due t prematu e debonding f the FRP laminates prior to utilizing the lamin tes strength, and typically results in brittle m mber failu . To overcome this issu , studies have hown hat proper anchorage sy tems mitigate debonding and enables he achievement of higher strengthening level . Out of th many anchorage systems es arched, FRP splay anchors have proven to b effective in enhancing member’s capacity by delaying the lami ates debonding. However, the literature is lacking adequat information on th effe t of splay anchors on the p rformanc externally stre gthened RC beams n shear. Accordingly, five shear def cient RC T-b ams ecimens were cast and strengthened with CFRP U-wrapped l inate and anchored with CFRP anchors. The paramet r inve tigated in this study is the anchor dowel diameter. Three dow l di eters were tested: 12 mm, 14 mm, and 16 mm. Th performance of the anchored U-wrapped specimens in terms of failure mod s, load defl ction responses, she r strength, strain in CFRP laminates, and ductility is compared to that of unstrengthened and unanch red streng he ed c trol p cimens. Test esults showed that CFRP anchors delayed debonding of the U-wraps, improved the shear of unanch red U-wrap , and significantly nhanced the ductility of the beam spec mens. In addition, it was conclud d th t anchoring CFRP laminates with CFRP a chors highly utilized the s rain attained in CFRP laminates. No clear trend was observed betwee anchor di eter and ultimate load-carrying capacity of the specime s. Based on the results of this s udy, anch r dow l diam ter of 14 mm was fou optimum for an anchor embedmen d pth of 85 mm. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of European Structural Integri y Soci ty (ESIS) ExC K ywords: shear; r inforced concrete; T-b ams; str ngthening; CFRP; fiber-reinforced polymers; U-Wraps; FRP splay anchors. 1st Virtual European Conference on Fracture Shear strengthening of reinforced concrete T-beams using CFRP laminates anchored with bent CFRP splay anchors Haya H. Mhanna a , Rami A. Hawileh a,* , Jamal A. Abdalla a a Department of Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, United Arab Emirates

* Corresponding author. Tel.: +971-6-5152496; fax: +971-6-5152979 E-mail address: rhaweeleh@aus.edu * Corresponding author. Tel.: +971-6-5152496; fax: +971-6-5152979 E-mail address: rhaweeleh@aus.edu

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y So i ty (ESIS) ExC

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.095