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Development of New Strengthening Methods Preventing Early Delamination Failure of CFS
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 Title & Authors
Development of New Strengthening Methods Preventing Early Delamination Failure of CFS
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 Abstract
The strengthening method with CFS(Carbon Fiber Sheet) has some fatal defects that the beams strengthened with CFS is always failed far below its ultimated strenth due to rapid progress of horizontal delamination. The crack between beam and CFS are always started from the center of the beam and propagated to the end of the beam. The moment of the beam is always the largest in the middle of the beam, so is the tensile force of the CFS. The bumped surface of the CFS causes debonding force depending on the tensile force of CFS. In this study, two methods which delay early delamination are suggested and proved its validity, experimentally. The first method is using anchor bolt at the end of CFS, and the second method is using CFS wrap aroud at the center and the end of beam. The maximum load and ductility of the two methods are increased significantly. However, the maximum load is still far below the ultimate load. That's because the tensile strength of CFS is so large that its tensile strength can not be reached under normal loading condition. The ductility of the strengthened beam is improved more that twice before modiffication.
 Keywords
CFS;Strengthening;Delamination;Shear Fixing;Anchor Bolt;
 Language
English
 Cited by
1.
강판으로 보강된 RC보의 에폭시-콘크리트 계면의 부착특성,박윤제;신동혁;이광명;신현목;

한국콘크리트학회논문집, 2001. vol.13. 3, pp.221-227 crossref(new window)
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