| Abstract [eng] |
The doctoral dissertation analyses a review of state-of-the-art research on the reinforced concrete beams strengthened with CFRP and the parameters of the contact zone between CFRP and concrete. Analytical methods that can evaluate the strength, stiffness of composite beams and possible maximum bond force between concrete and CFRP are described. Reinforced concrete beams strengthened with CFRP with and without initial cracks were tested during the experiment. Based on the data of the performed experiment, deflection calculations were performed according to the EC2 methodology. The obtained experimental results are compared with the iteration method, ACI, ISIS and fib norms. An analytical model describing the bond force and shear stress between CFRP and concrete was proposed. The obtained results are compared with the results obtained in the theory of built-up bars. The supplemented analytical method can describe the bond force and shear stress of cracked (low cracking intensity) elements over the length of the element, the results obtained are verified by the FEM. The reinforced concrete beam strengthened with CFRP was also calculated by the FEM, the parameters describing the bond between the CFRP and the concrete were analysed, and the deflection curves from the applied load were obtained, which were compared with the performed experiment. |
