Issue34

I. Ivanova et alii, Frattura ed Integrità Strutturale, 34 (2015) 90-98; DOI: 10.3221/IGF-ESIS.34.09 97 taken into account for the concrete in compression and tensile reinforcement through Wöhler curves associated with the accumulation to deal with law. a) CB3u static test without fatigue b) CB3u after one million cycles Figure 8 : Cracking and failure in strengthened concrete corbel. a) CB3u-static loading to failure, b) CB3u -after one million cycles. This paper interested of reinforced short concrete jacket having a defect such as an undersized tensile steel. Carbon fiber fabrics have interesting properties and offer the user new opportunities in the Civil Engineering sector. The preparation of concrete surface described by Ivanova and all [12], was very important in gluing success. The specimens are instrumented with sensors strain electric gauges which allowed to follow strains in several carefully selected points. In fact, the results show a significant improvement of the ultimate load capacity of up to twice the value obtained by an unstrengthened reinforced corbel. It is increased third of rigidity of strengthened reinforced concrete corbel by wrapping. The fatigue test had a definite influence on the cracking of reinforced concrete corbel and modified stresses in the specimen. But, the mechanical damage has little effect on ultimate load. Of course, in this case of reinforced concrete corbel, after fatigue damage, the ultimate load is substantially the same as to undamaged reinforced concrete corbel. The results show also that, the effect of fatigue on reinforced concrete short brackets, in a substantially lower tensile strength to 10 % relative to reinforced concrete short corbel load under monotone static test. The experimental results of this study are interesting and must be completed by further tests to highlight the significant damage parameters in the numerical and analytical modeling of strengthened corbel. R EFERENCES [1] Robinson, J.R., L’armature des consoles courtes. Aus theorie und praxis des stahlbetonbaues, Wilhelm Ernst u. Sohn, Berlin/München (1969). [2] Ivanova, I., Comportement mécanique de consoles cortes en béton armé renforce ou réparée par collage de matériaux composites, Thèse de Doctorat, Université de Reins Champagne-Ardenne, France, (2013). [3] Ivanova, I., Assih, J., Li, A., Delmas, Y., Experimental investigation of strengthened short reinforced concrete corbels by bonding carbon fiber fabrics, Journal of Adhesion Science and Technology, 29 (20), 2176-2189, 2015. [4] Ivanova, I., Assih, J., Li, A., Dontchev, D., Hadjov, K., Delmas, Y., Effet du renforcement sur la performance de consoles courtes en béton armé, 32 ème Rencontres Universitaires de Génie Civil, Orléans, (2014). [5] Quiertant, M., Benzarti, K., Matériaux composites pour le renforcement des structures de génie civil, Revue des composites et des matériaux avancés, 22 (2) (2012). [6] Ahmad, S., Shah, A., Nawaz, A., Salimullah, K., Shear Strengthening of Corbels with Carbon Fibre Reinforced Polymers (CFRP), Materiales de Construcción, 60(299) (2010) 79-97. [7] Anis A. Mohamad-Ali, Muhammad Abed Attiya, Experimental behaviour of reinforced concrete corbels strengthened with carbon fibre reinforced polymer strips, Basrah Journal for Engineering Science, (2012 31-45.