Thèse soutenue

Approches locales et globales du comportement de dalles en béton armé renforcées par matériaux composites
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Auteur / Autrice : Laurent Michel
Direction : Patrice HamelinEmmanuel Ferrier
Type : Thèse de doctorat
Discipline(s) : Génie civil
Date : Soutenance en 2007
Etablissement(s) : Lyon 1

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Résumé

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The civil engineering domain is in a constant evolution and, these last years, the reinforcement sector progressed a lot. An important number of reinforced concrete structures are damaged due to accidents, building redevelopment or climatic actions. The reinforcement by composites materials allows to the RC structures, formerly damaged, get back in initial behavior. The reinforcement by composites materials correspond to the bonding of CFRP in the damaged area. The reinforcement by composites materials can be applied to all components of RC structures (beams, columns and slabs). Researches, in beams and columns, show that the loads and the deflection evolve. The ultimate load increase strongly and the deflection decrease with the reinforcement by composites materials sections increase. For slabs studies, two types of failure appear the first called bending failure and the second punching. The bending failure, ductile, corresponding to important cracks near by composite extremity. The punching, brittle, failure corresponds at the vertical displacement of concrete cone in the slab depth. Punching is a local phenomenon brings about the failure of structure. The results present the reinforcement of RC slabs is better when the depth of the structure is small. For the reinforced slabs behavior, the conclusions are the same that the beam structures, the reinforcement by composites materials improve the ultimate load and decrease the deflection value. So use these conclusions in the structure design, a numerical model is developed. The calculation allows defining the ultimate load of structures, to calculate the different strains (in steel and composites) as drawing the deflection during the loading. At last, a recommendation method allows the reinforcement by composites materials use in the civil engineering design offices is proposed