The Stress’s State Analysis of Carbon Fibre Reinforced Concrete Elements Evaluating the Bond Influence
The Stress’s State Analysis of Carbon Fibre Reinforced Concrete Elements Evaluating the Bond Influence

Summary/Abstract: While strengthening structures with thin layered elements an important role is carried out by the bond between separate elements, but there are not any methods which would describe the distribution of bond stress in the contact zone when the concrete behaviour is elastic and plastic. In this article a single span reinforced concrete beam which is strengthened by CFRP (Carbon fibre reinforced polymer) is analysed and three methods which could describe bond stress through the length of the element are provided. The three compared methods are: finite elements method (FEM), theory of multiple rods and the proposed method of the authors. The similarities and differences of results are shown by diagrams and discussed. The method that the authors propose is superior to other methods because of evaluation of the plastic behaviour of concrete which is not possible to evaluate it by the method of the theory of multiple rods.

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