MODELING CONFINED ZONE EFFECT IN REINFORCED CONCRETE CORBEL STRENGTHENED BY CFRP
DOI:
https://doi.org/10.59957/jctm.v60.i6.2025.10Keywords:
Reinforced concrete, Corbel, CFRP, Mechanical behaviour, Finite Elements, StrengtheningAbstract
Confined zone effect, which is primarily observed in reinforced concrete (RC) columns subjected to compression, is crucial for the load-bearing capacity of (RC) structures. This occurs when, despite an increase in the load, the resulting deformations are nearly zero. The same effect can be observed in structures strengthened by different types of fabrics (carbon, glass, Kevlar, etc.). It is well known that experimental studies are a high-resources and time-consuming process. Therefore, a combination of experimental study and non-linear finite element (FE) simulation strategy is considered. The structure investigated in this paper is an RC corbel strengthened by bonding carbon fibre reinforced polymer (CFRP). Two RC corbel structures were developed, one with strengthening by three layers of CFRP and one without strengthening. The experimental results were used to validate the FE simulation. The model was successfully validated and provides opportunities for future parametric investigations. The aim of this study is to model he confined zone effect in reinforced concrete corbels strengthened by CFRP. Modelling confined zone effect is a significant challenge for engineers. This study shows a new approach to FE simulation. The resulting model successfully simulates the mechanical behaviour of the structure.
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