Browse > Article

Post-tensioning System with Externally Unbonded 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. 147-154 More about this Journal
Abstract
Experimental study has been performed in order to investigate the behavior of RC beams strengthened with externally unbonded post-tensioned CFRP (Carbon Fiber Reinforced Polymer) strips using embedded or stud-type plate anchorages. Total 10 small-scaled specimens were manufactured with the different post-tensioning level and types of mechanical anchorage as a main test parameter. A control specimen and specimens with simply bonded CFRP strips were included to compare the structural performances of each 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 unbonded CFRP strips reached the rupture strength of the CFRP strip. Also, it was observed that the specimens with stud-type anchorage have equivalent strengthening performance compared with embedded-type anchorage.
Keywords
CFRP strip; Debonding failure; Externally unbonded post-tensioning; Rupture strength;
Citations & Related Records
연도 인용수 순위
  • Reference
1 유영찬, 최기선, 김긍환, '외부프리스트레스트 탄소섬유판에 의한 RC구조물 보강공법의 정착시스템 기본형상 결정시험', 대한건축학회 추계학술발표대회논문집, 대한건축학회, 제24권 2호, 2004. 10, pp. 143-146
2 최기선, 유영찬, 박영환, 박종섭, 김긍환, '탄소섬유판으로 보강된 RC보의 휨 거동' 한국콘크리트학회 봄학술발표논문집, 한국콘크리트학회, 2005. 5, pp. 287-290
3 ACI 440. 2R-02 'Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures', ACI Committee 440
4 Concrete Society Technical Report No. 55, 'Design guidance for Strengthening concrete structures using fibre composite materials', The Concrete Society
5 CEB-FIP, 'Externally bonded FRP reinforcement for RC structures', Trechnical report, bulletin 14, March 2001
6 Seim, W., Horman, M., Karbhari, V. and Seible, F., 2001, 'External FRP post-streng thening of scaled concrete slabs' J. Compos. for Constr., ASCE, V.5, No. 2, pp. 67-75   DOI   ScienceOn
7 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
8 CSA Standard, 'Design and Construction of Building Components with Fibre-Reinforced Polymers', S806-02, Canadial Standards Association
9 ACI 440. 4R-04 'Prestressing Concrete Structures with FRP Tendons', ACI Committee 440
10 한국건설기술연구원, '외부프리스트레스트 탄소섬유판에 의한 구조물 보강공법 개발', 건설교통부연구개발사업, E01-01, 2005, pp. 277-408
11 유영찬, 최기선, 박영환, 박종섭, 김긍환, '외부 프리스트레스트 탄소섬유판 정착장치의 콘크리트에 대한 정착성능', 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2006. 5, pp. 226-229
12 유영찬, 최기선, 김긍환, '탄소섬유복합체로 보강된 RC부재의 보강재 강성에 따른 휨 보강성능' 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2006. 11, pp. 129-132
13 최기선, 유영찬, 박영환, 박종섭, 김긍환, '외부 프리스트레스트 탄소섬유판으로 보강된 실물모형 RC보의휨 거동', 한국구조물진단학회 봄학술발표논문집, 한국구조물진단학회, 2006. 5, pp. 303-308
14 유영찬, 최기선, 박영환, 박종섭, 김긍환, '외부 부착형 프리스트레스트 탄소섬유판으로 보강된 RC보의휨 거동', 한국콘크리트학회봄학술발표논문집, 한국콘크리트학회, 2005. 5, pp. 255-258
15 Zou, X. W., 'Flexural Behavior and Deformability of Fiber Reinforced Polymer Prestressed Concrete Beams' J. Compos. for Constr., ASCE, V. 7, No. 4, 2003, pp. 275-284   DOI   ScienceOn