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http://dx.doi.org/10.4334/JKCI.2007.19.4.467

Flexural Behavior and Analysis of RC Beams Strengthened with Prestressed CFRP Plates  

Yang, Dong-Suk (Dept. of Civil Engineering, Sherbrooke University)
Park, Jun-Myung (Dept. of Civil Engineering, Sungkyunkwan University)
You, Young-Chan (Building Research Dept., Korea Institute of Construction Technology)
Park, Sun-Kyu (Dept. of Civil Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korea Concrete Institute / v.19, no.4, 2007 , pp. 467-474 More about this Journal
Abstract
In this paper, a total of 13 beams with bonding, anchorage system, amount of prestressing and span length as variables of experiment were tested in flexural test and analyzed in finite element analysis; one control beam, two simplified FRP-boned beams, four prestressed FRP-unbonded beams and four prestressed FRP-bonded beams. Also, a nonlinear finite element analysis of beams in the flexural test is performed by DIANA program considered material nonlinear of concrete, reinforcement and the interfacial bond-slip model between concrete and CFRP plates. The failure mode of prestressed CFRP plated-beams is not debonding but FRP rupture. RC members strengthened with external bonded prestressed CFRP plates occurred 1st and 2nd debonding of the composite material. After the debonding of CFRP plates occurs in bonded system, behavior of bonded CFRP-plated beams change into that of unbonded CFRP-plated beams due to fix of the anchorage system. Also, It was compared flexural test results and analytical results of RC members strengthened with CFRF plates. The ductility of beams strengthened by CFRP plates with the anchorage system is considered high with the ductility index of above 3. Analysis results showed a good agreement with experiment results in the debonding load, yield load and ultimate load.
Keywords
anchorage system; CFRP plate; ductility; finite element analysis; flexural test;
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