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Post-tensioning System with Externally Bonded CFRP Strips for Strengthening RC Members  

You, Young-Chan (한국건설기술연구원)
Choi, Ki-Sun (한국건설기술연구원)
Kim, Keung-Hwan (한국건설기술연구원)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.12, no.6, 2008 , pp. 155-163 More about this Journal
Abstract
Experimental study has been performed in order to investigate the behavior of RC beams strengthened with externally bonded post-tensioned CFRP (Carbon Fiber Reinforced Polymer) strips. Specimens consist of 9 small-scaled specimens with the different post-tensioning level as a main test parameter. A control specimen and specimens with simply bonded CFRP strips have been manufactured to compare the structural performances of prestressed system. From the test results, it was observed that the specimens strengthened with simply bonded CFRP strips showed debonding failure below 50% of CFRP tensile strength due to premature debonding. On the other hand, all the specimens strengthened with post- tensioned CFRP strips reached the rupture strength of the CFRP strip. The cracking and yielding loads were also increased proportionally to the post-tensioning level, but the ultimate loads were nearly equal regardless of the post-tensioning level.
Keywords
CFRP strip; Debonding failure; Externally bonded post-tensioning; Rupture strength;
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  • Reference
1 ACI 440. 4R-04 'Prestressing Concrete Structures with FRP Tendons', ACI Committee 440
2 CSA Standard, 'Design and Construction of Building Components with Fibre-Reinforced Polymers', S806-02, Canadial Standards Association
3 CEB-FIP, 'Externally bonded FRP reinforcement for RC structures', Trechnical report, bulletin 14, March 2001
4 El-Hacha, R., Wight, R. G. and Green, M. F., 2004, 'Prestressed Carbon Fiber Reinforced Polymer Sheets for Strengthening Concrete Beams at Room and Low Temperatures' J. Composite. for Construction, ASCE, V. 8, No. 1, pp. 3-13   DOI   ScienceOn
5 한국건설기술연구원, '외부프리스트레스트 탄소섬유판에 의한 구조물 보강공법 개발', 건설교통부연구개발사업, E01-01, 2005, pp.277-408
6 유영찬, 최기선, 김긍환, '외부프리스트레스트 탄소섬유판에 의한 RC구조물 보강공법의 정착시스템 기본형상 결정시험', 대한건축학회 추계학술발표대회논문집, 대한건축학회, 제24권 2호, 2004. 10, pp.143-146
7 유영찬, 최기선, 박영환, 박종섭, 김긍환, '외부 부착형 프리스트레스트 탄소섬유판으로 보강된 RC보의휨 거동', 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2005. 5, pp. 255-258
8 최기선, 유영찬, 박영환, 박종섭, 김긍환, '외부 프리스트레스트 탄소섬유판으로 보강된 실물모형 RC보의휨 거동', 한국구조물진단학회봄학술발표논문집, 한국구조물진단학회, 2006. 5, pp. 303-308
9 ACI 440. 2R-02 'Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures', ACI Committee 440
10 최기선, 유영찬, 박영환, 박종섭, 김긍환, '탄소섬유판으로 보강된 RC보의 휨 거동' 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2005. 5, pp. 287-290
11 Christopher K.Y. Leung et al, 'Empirical Approach for Determining Ultimate FRP Strain in FRP- Strengthened Concrete Beams' Journal of Composite for Construction, March-April 2006, pp. 125-138
12 Concrete Society Technical Report No. 55, 'Design guidance for Strengthening concrete structures using fibre composite materials', The Concrete Society
13 Wendel M.Sebastian, 'Signigicance of midspan debonding failure in FRP-plated concrete beams' Journal of Structural Engineering, July 2001., pp. 792-798
14 유영찬, 최기선, 김긍환, '탄소섬유복합체로 보강된 RC부재의 보강재 강성에 따른 휨 보강성능' 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2006. 11, pp. 129-132
15 유영찬, 최기선, 박영환, 박종섭, 김긍환, '외부 프리스트레스트 탄소섬유판 정착장치의 콘크리트에 대한정착성능', 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2006. 5, pp. 226-229