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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Behavior of RC Beams Strengthened with Externally Post-Tensioning CFRP Strips
Author(s): K.-S. Choi, Y.-C. You, Y.-H. Park, J.-S. Park, and K.-H. Kim
Publication: Special Publication
Appears on pages(s): 515-528
Keywords: bonded; CFRP strips; debonding failure; external post-tensioning; strengthening; unbonded
Abstract:Experimental study has been performed in order to investigate the behaviorof RC beams strengthened with externally post-tensioning CFRP (Carbon FiberReinforced Polymer) strips. A total of 11 specimens have been manufactured of whichspecimens strengthened with bonded or unbonded CFRP strips considering the level ofpost-tensioning as experimental variable, and a specimen with simply bonded CFRPstrips. The following phenomena have been observed through the experimental results.The specimen with simply bonded CFRP strips failed below 50% of its tensile strengthdue to premature debonding. On the other hand, all the specimens strengthened withpost-tensioning CFRP strips showed sufficient strengthening performance up to theultimate rupture load of the CFRP strips. Also, it was observed that the cracking loadsand yield loads of the strengthened beams were increased proportionally to the post-tensioning level, but the ultimate loads were nearly equal regardless of the post-tensioning level and bonded or unbonded system. In addition, the yield loads andcracking loads of the beams with bonded post-tensioning systems were increasedabout 20% compared with those of the unbonded post-tensioning systems. However,the beams strengthened with unbonded post-tensioning CFRP strips showed ductilebehaviour with large deflections resulting from the reduced member stiffness.
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