CONTRIBUTION A L'ANALYSE DU COMPORTEMENT MECANIQUE DE DALLES EN BETON ARME RENFORCEES PAR MATERIAUX COMPOSITES

Abstract : The use of externally bonded composite materials for strengthening reinforced concrete structures has received considerable attention in recent years. The object of this thesis is the analysis of reinforced concrete slabs strengthened with composite materials. After a technical study of reinforcement techniques, the bibliographical review deals with the analysis of proposed design methods, especially in the case of strengthened slabs where the composite contribution requires the consideration of biaxial behaviour of composite reinforcement resulting from two-way slab behaviour.

In this context, an experimental study was carried in order to evaluate the performances of various composite failure theories. To accomplish this, a functional efficient composite cruciform specimen was optimised via a set of finite element simulations. This study confirmed the efficiency of the Tsai-Wu criterion to predict the strength of the composite used for the strengthening of the slab namely [0°/90°] carbon/epoxy lamina.

The second part concerns the elaboration of an analytical and experimental procedure in order to evaluate the effect of composite at ultimate stage as well as the study of different parameters governing the stiffness of strengthened slabs. The results shows clearly the influence of composite in particular on the slab carrying capacity which can be increased until five times.

The analysis of the failure mode obtained experimentally confirms that the collapse of slab occurs essentially by punching. Consequently, the last part of this work concerns the introduction of the effect of composite reinforcement in the model of Menétrey to evaluate the punching shear strength of strengthened slabs. The results show good agreement between the predicted and experimental values.
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El Houssain Rochdi. CONTRIBUTION A L'ANALYSE DU COMPORTEMENT MECANIQUE DE DALLES EN BETON ARME RENFORCEES PAR MATERIAUX COMPOSITES. Matériaux. Université Claude Bernard - Lyon I, 2004. Français. ⟨tel-00138446⟩

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