| The application of strengthening technology with externally bonded carbon fiber reinforced plastic (CFRP) laminates is more and more popular in construction-strengthening, because of its light weight, high-strength, corrosionproof, antifatigue, and easy to cutting and construction etc. In this thesis, a deeply investigation about mechanism of debonding from Strengthening RC beams and debonding capacity is carried out. The main research contents and work are as follows:1. Nine full-size simply supported rectangular section reinforced concrete beams were made in this experiment (one was a reinforced concrete beam, the rest were reinforced by the external bonding of carbon fiber sheet and plate respectively), and experimental investigation and theoretical analysis of the bending capabilities were carried out.2. The influence of different coherent interface and sustaining load states before strengthening about debonding failure were investigated in this paper.3. The theoretical analysis of strengthened beams about mechanism of debonding and fail mode at different stage are carried out in this paper.4. A method about how to calculate the bonding shear stress and bonding peel normal stress in flexible stage is proposed. The simulation analysis through Ansys program is worked out to analyze strengthened beams, get the bonding peel normal stress and bonding shear stress, the outcomes and the experiment data is correlate well with the outcome of that method.5. Bring forward a method about how to calculate the debonding load. The outcome of this method which be used to calculate this experiment is correlate well with experiment data.6. Some measures to avoid debonding failure in ways of material and construction are proposed, and it can be used in engineering. |
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