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http://dx.doi.org/10.4334/JKCI.2005.17.6.993

Rip-off Failure Mechanism of Reinforced Concrete Beams Strengthened with CFRP Plate  

Sim Jong-Sung (Dept. of Civil Engineering, Hanyang University)
Moon Do-Young (Dept. of Civil Engineering, Hanyang University)
Park Cheol-Woo (Dept. of Civil Engineering, Hanyang University)
Park Sung-Jae (Dept. of Civil Engineering, Hanyang University)
Choi Kwang-Min (Yongma Engineering)
Publication Information
Journal of the Korea Concrete Institute / v.17, no.6, 2005 , pp. 993-1000 More about this Journal
Abstract
Various types of FRP materials have been applied for structural strengthening of RC beams in various forms. When CFRP plates are used, a premature failure used to occur before enough strengthening effect appears. This is primarily due to the rip-off of CFRP Plate attached on RC beams. Despite of numerous studies on the rip-off failure of externally strengthened RC beams, its failure mechanism is not definitely clarified yet. Investigations from literatures have shown that the rip-off failure is dependant on the vertical and shear stresses at the level of main reinforcements in RC beams. This study suggests an analytical model to Investigate the rip-off failure load based on the stress states at the level of main reinforcements. The proposed model is relatively simple and produces very comparable results to the test data. It is believed that the proposed model can be successfully used to provide more information on the rip-off failure mechanisms and its prevention.
Keywords
RC beam; CFRP; initial cracking load; rip-off failure load; main reinforcement;
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