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http://dx.doi.org/10.4334/JKCI.2009.21.3.337

An Experimental Study on the Shear Behavior of RC Beams Strengthened with Near Surface Mounted and Externally Bonded CFRP Strips  

Lim, Dong-Hwan (Dept of Civil Engineering, Dongseo University)
Kwon, Yeong-Soon (Jae Shin Construction, Ltd.)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.3, 2009 , pp. 337-345 More about this Journal
Abstract
The purpose of this study is to investigate the shear strengthening effectiveness of the beams strengthened with near surface mounted (NSM) and external bonded (EB) CFRP strips. A total of nine concrete beams were made and tested. From this study, it was found that the shear stiffness and strength of the beams strengthened with NSM and EB strips were significantly improved compared to the control beam. Failure of the beam strengthened with NSM and EB strips was initiated by shear cracks, propagated diagonally to the adjacent epoxy grooves without crossing the epoxy and finally sudden diagonal crack connecting the point of application of load and flexural crack was occurred. For the beam strengthened combined with NSM and EB CFRP strips, the tensile strains in the NSM CFRP strips were observed in the range of 0.35% to 0.45% and strains with EB strips were measured about 0.3%.
Keywords
shear; near surface mounted (NSM); external bonded (EB); CFRP;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 De Lorenzis, L. and Teng, J. G., “Near-Surface Mounted FRP Reinforcement: An Emerging Technique for Strengthening Structures,” ELSEVIER, Composite Part B, Vol. 38, 2007, pp. 119-143   DOI   ScienceOn
2 Oehlers, D. J., Liu, I., and Seracino, R., “A Generic Design Approach for EB and NSM Longitudinally Plated RC Beams,” ELSEVIER, Construction and Building Materials, Vol. 27, 2007, pp. 697-708   DOI   ScienceOn
3 Oehlers, D. J., Rashid, R., and Seracino, R., “IC Debonding Resistance of Group of FRP NSM Strips in Reinforced Concrete Beams,” ELSEVIER, Construction and Building Materials, Vol. 22, 2008, pp. 1574-1582   DOI   ScienceOn
4 Sena-Cruz, J. M. and Barros, J. A. O., “Modeling of Bond between Near-Surface Mounted CFRP Laminate Strips and Concrete,” Comput Sturct J, Vol. 82, No. 17, 2004, pp. 1513-1521   DOI   ScienceOn
5 Mohamed Ali, M. S., Oehlers, D. J., Giffith, M. C., and Seracino, R., “Interfacial Stress Transfer of Near Surface Mounted FRP-to-Concrete Joints,” ELSEVIER, Engineering Structure, In Press
6 Nanni, A., Di Ludovico, M., and Parretti, R., “Shear Strengthening of PC Bridge with NSM CFRP Rectangular Bars,” Adv Struct Engr., Vol. 7, No. 4, 2004, pp. 97-109.   DOI   ScienceOn
7 Rizzo, A. and De Lolenzis, L., “Behavior and Capacity of RC Beams Strengthened in Shear with NSM FRP Reinforcement,” ELSEVIER, Construction and Building Materials, In Press
8 임동환, “ 표면매입 및 외부부착 탄소섬유판으로 보강된 RC보의 휨 거동에 관한 실험연구,” 콘크리트학회 논문집, 20권, 5호, 2008, pp. 601-610   과학기술학회마을   DOI
9 정우태, 박종섭, 박영환, 강재윤, “표면매립보강재를 이용한 철근콘크리트보의 휨보강에 대한 연구,” 대한토목학회논문집, 27권, 1A호, 2007, pp. 27-33
10 Fib-Bulletin 14, “Externally Bonded FRP Reinforcement for RC Structures,” Technical Report by Task Group 9.3 FRP (Fiber Reinforced Polymer) Reinforcement for Concrete Structures, Federation Incternationale du Beton-FIB, July, 2001
11 Liu, I., Oehlers, D. J., and Seracino, R., “Test on the Ductility of Reinforced Concrete Beams Retrofitted with FRP and Steel Near Surface Mounted Plates,” ASCE, Composite Construction Journal, Vol. 10, No. 2, 2006, pp. 106-114   DOI   ScienceOn
12 Raizal Saifulnaz, M. R., Oehlers, D. J., and Seracino, R., “IC Debonding of FRP NSM and EB Retrofitted Concrete: Plate and Cover Interactions Tests,” ASCE, Composite, In Press
13 Barros, J. A. O. and Dias, S. J. E., “Surface Mounted CFRP Laminates for Shear Strengthening of Concrete Beams,” ELSEVIER, Cement & Concrete Composites, Vol. 28, 2006, pp. 276-292   DOI   ScienceOn
14 Seracino, R., Raizal Saifulnaz, M. R., and Oehlers, D. J., “Generic Intermediate Crack Debonding Resistance of EB and NSM Plate-to-Concrete Joints,” ASCE, Composite Construction Journal, Vol. 11, No. 1, 2007, pp. 62-70   DOI   ScienceOn
15 ACI Committee 440, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, 2005
16 Novidis, D., Pantazopoilou, S. J., and Tentoluris, E., “Experimental study of bond of NSM-FRP reinforcement,” ELSEVIER, Construction Building Materials, Vol. 27, 2007, pp. 1760-1770   DOI   ScienceOn
17 임동환, 남민희, “탄소섬유판 (CFRP strip)으로 보강된 철근콘크리트 부재의 전단거동,” 콘크리트학회 논문집, 20권, 3호, 2008, pp. 299-305   과학기술학회마을   DOI
18 정우태,박종섭, 박영환, “탄소섬유보강재료 표면매립 보강된 철근콘크리트보의 파괴모드 예측,” 대한토목학회논문집, 28권, 3A호, 2008, pp. 349-356