The main focus of this paper is to investigate numerically the applicability of external composite bonding to strengthen reinforced concrete beams. Three-dimensional numerical modelling was carried out for predicting the failure of RC beams strengthened with advanced composites. The investigation has involved the influence assessment of thickness and length of composites on the flexural performance of the beams strengthened with the composites. The results from few selected experimental test are used to verify the finite element modelling and the associated computer analysis procedures. The numerical simulation, which is based on finite element analysis, follows the smeared crack approach, and uses standard elements available in a commercial package. Comparison of numerical and experimental results shows good agreement in many of the cases studied. It is demonstrated that the behaviour of beams strengthened with composites can be predicted using the finite element model.

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