PSI - Issue 28

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 28 (2020) 2312–2319

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

© 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 Carbon fiber reinforced polymers (FRP) have been used widely as Externally Bonded Reinforcing (EBR) materials for strengthening and retrofitting of RC structural members, both in flexure and shear. The use of high strength Galvanized Steel Mesh (GSM) strengthening material has recently gained wide acceptance as well. Both CFRP and GSM have many advantages and some shortcomings. One of their major shortcoming is the lack of ductility. Recently developed Aluminum Alloys (AA) has high ductility and some desirable features that may overcome some of the shortcomings of GSM and CFRP laminates. The major aim of this research is to develop a hybrid ductile strengthening system by combining AA plates with GSM and CFRP laminates to strengthen RC beams in flexure. An experimental program that includes tensile test of six coupon specimens and five flexure tests of beam specimens were conducted. The test results showed the effect of hybrid combination on both strength and ductility of the tested beams and that the newly proposed hybrid systems are promising in improving the flexural behaviour in terms of strength and ductility. The tested hybrid coupons of AA with high density steel mesh (SMH) and AA with CFRP showed an increase in the strain capacity by 6.52 and 4.55 times, respectively compared to that of GSM and CFRP alone. The flexural capacity of the beams strengthened with hybrid laminate increased by around 28% over the control beam, while the beam strengthened with hybrid GSM and AA (SMH+AA) laminate showed an ultimate deflection equivalent to 98.5% of the un-strengthened control beam. The failure modes of the tested beams included debonding and delamination and they were influenced by the type of hybrid system used. Keywords: externally-bonded reinforcement, flexural strengthening, carbon fiber reinforced polymers, galvanized steel mesh, Aluminum alloy, hybrid systems. 1st Virtual European Conference on Fracture Flexural Strengthening of Reinforced Concrete Beams with Externally Bonded Hybrid Systems Jamal A. Abdalla a *, Abubakr Mohammed b , Rami A. Hawileh a a Professor of Civil Engineering, American University of Sharjah, Sharjah, UAE b Formerly Graduate Student, Department of Civil Engineering, American University of Sharjah, Sharjah, UAE Abstract Carbon fiber reinforced polymers (FRP) have been used widely as Externally Bonded Reinforcing (EBR) materials for strengthening and retrofitting of RC structural members, both in flexure and shear. The use of high strength Galvanized Steel Mesh (GSM) strengthening material has recently gained wide acceptance as well. Both CFRP and GSM have many advantages and ome shortcomings. One of their major shortcomi g is th lack of ductility. Rec ntly developed Aluminum All ys (AA) has high ducti ity and some desirabl features t at may overcome some of the shortcomings of GSM and CFRP laminates. The major aim of this rese rch is to develo hybrid ductile strengtheni g system by combining AA plates with GSM and CFRP laminates to strengthen RC beams in flexure. An experim al program that includes tensile test of six coupon specime s and five flexur t sts of beam specim ns were conducted. The test results showed the effect of hybrid combination on both str ngth and uctility of the tested beams and that the newl proposed hybrid sy tems are promising in i proving th flexural behaviour in terms of strength and ductility. The tested hybrid coup n of AA with h gh density st e mesh (SMH) and AA with CFRP showed an increa e in the strain capacity by 6.52 and 4.55 times, respectively compared to that of GSM and CFRP alone. The fl xural ca acity of t e eams strength ned with hybrid laminate increased by around 28% over the control be m, while the beam str ngthene with hybrid GSM and AA (SMH+AA) laminate showed ultimate deflection equivalent to 98.5% of the un-strengthened control beam. The failure modes of th tested beams inclu ed debondi g and d lamination and they were influenced by the type of hybrid syst m us d. Keywords: externally-bonded reinforcement, flexural strengthening, carbon fiber reinforced polymers, galvanized steel mesh, Aluminum alloy, hybrid systems. 1st Virtual European Conference on Fracture Flexural Strengthening of Reinforced Concrete Beams with Externally Bonded Hybrid Systems Jamal A. Abdalla a *, Abubakr Mohammed b , Rami A. Hawileh a a Professor of Civil Engineering, American University of Sharjah, Sharjah, UAE b Formerly Graduate Student, Department of Civil Engineering, American University of Sharjah, Sharjah, UAE

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: jabdalla@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 10.1016/j.prostr.2020.11.078 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 under responsibility of the European Structural Integrity Society (ESIS) ExCo * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: jabdalla@aus.edu