Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical-numerical investigation

Baghdad Krour (1) , Fabrice Bernard (1) , Abdelouahed Tounsi (2)

1 LGCGM - Laboratoire de Génie Civil et Génie Mécanique
2 UDL - جامعة جيلالي اليابس [سيدي بلعباس، الجزائر] = Université Djillali Liabès [Sidi Bel Abbès, Algérie] = Djillali Liabes University [Sidi Bel Abbès, Algeria]

Important failure mode of such plated beams is the debonding of the FRP plates from the concrete due to high level of stress concentration in the adhesive at the ends of the FRP plate. This paper presents a new method for reducing interfacial stresses in a concrete beam bonded with the FRP plate by including the effect of the fiber orientation in the FRP plate. This work is divided into two parts; the first one is based on the laminates theory for the analytical solution where a minimization method is used to directly determine the fiber orientation reducing the interfacial stresses. The second part consists into a Finite Element modeling where the analytical solution and different fibers orientation combinations are tested for improving strengthening quality. Numerical results from the present analysis are presented in order to show the advantages of the present solution over existing ones and to reconcile debonding stresses with strengthening quality.

Mots clés: FRP composites; Interfacial stresses; Fibers orientations; Strengthening; Concrete beam

Domaines: Sciences de l'ingénieur [physics]

Baghdad Krour, Fabrice Bernard, Abdelouahed Tounsi. Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical-numerical investigation. Engineering Structures, 2013, 56, pp.218-227. ⟨10.1016/j.engstruct.2013.05.008⟩. ⟨hal-00839542⟩