Renforcement à l'effort tranchant des dalles épaisses en béton armé en conditions de service

Authors: Bédard, Frédéric
Advisor: Bastien, Josée; Mitchell, Denis
Abstract: With improved design standards, increasing demands on infrastructure and material degradation in the face of environmental conditions, many infrastructures need to be improved to provide sufficient safety margin. The shear strengthening of thick concrete slabs with epoxy-anchored bars, which is a promising method for structural improvement, has been studied in the last decade. In practice, given the significant loads that slabs may bear at the time of strengthening, it is reasonable to believe that the effectiveness of the latter may be reduced by the deformation and cracking present in the slab. In order to investigate the effect of the shear load at the time of strengthening with anchored transverse bars on the structural performance of a post-strengthened slab, an experimental and numerical study has been carried out. For the experimental part, five (5) slices of thick slab were fabricated. The slabs were tested by a three-point bending test where shear load levels were induced in the slabs at the time of strengthening. Following strengthening, the slabs were loaded up to shear failure. For the numerical study, a finite element model was first developed using the VecTorTM software to represent the behavior of the experimentally tested slabs. The effect of shear load at the time of strengthening and slenderness on post-strengthened slab performance was investigated through a parametric study. The results show that in the presence of usual service loads, the shear strengthening of thick slabs with anchored bars offers a considerable resistance gain, similar to that executed on an unloaded slab. However, for slabs strengthened at sufficiently high loads, the contribution to the ultimate strength of transverse bars and concrete is rearranged.
Document Type: Mémoire de maîtrise
Issue Date: 2019
Open Access Date: 1 August 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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