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Title |
Post-tensioning System with Externally Bonded CFRP Strips for Strengthening RC Members
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Keywords |
탄소섬유판 ; 박리파괴 ; 외부 부착 프리스트레스 ; 파단하중 CFRP strip ; Debonding failure ; Externally bonded post-tensioning ; Rupture strength |
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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 posttensioned 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.
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