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Several studies have been conducted to characterise the static behaviour of structural elements strengthened with composites, but fewer data regarding the fatigue behaviour are available. The main purpose of this paper is to compare the fatigue strength of fibre-reinforced polymers strengthened and plain reinforced concrete beams and to develop an analytical model to predict the fatigue life using data from different experiments. The paper uses data from a larger study undertaken by the authors to investigate the fatigue resistance of reinforced concrete beams strengthened with carbon, glass and aramid composites. The results obtained were combined with data from six other fatigue experiments found in the literature in order to generate a database for adjusting a fatigue model using regression analysis. Although an examination of the database reveals large scatter between fatigue results from different sources, the analysis carried out indicates that the models proposed are similar to other fatigue models found in the literature, but the adjusted model I seems to be more adequate to represent the declivity of the fatigue curve for fibre-reinforced polymers strengthened beams.

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