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Personne :
Bastien, Josée

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Bastien

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Josée

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Université Laval. Département de génie civil et de génie des eaux

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ncf10260071

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Résultats de recherche

Voici les éléments 1 - 7 sur 7
  • PublicationAccès libre
    Experimental and analytical studies of strengthening using drilled-in bonded shear reinforcement
    (Edinburgh : Engineering Technics Press, 2014-07-09) Fiset, Mathieu; Bastien, Josée; Mitchell, Denis
    In order to study means of improving the behaviour of thick slabs without shear reinforcement a series of large-scale beams representing thick slabs was constructed and tested. Companion specimens were strengthened using drilled-in reinforcing bars to study the effectiveness of this repair technique. The behaviour of these beams, before and after strengthening, is compared. An additional experimental program using pull-out specimens enabled a study of the bond characteristics of drilled-in reinforcement having different embedment lengths. An analytical model to predict the bond-stress versus slip relationship enabled the development of a method for predicting the influence of the added shear reinforcement in improving the shear strength. These predictions are compared with the experimental results and provide a practical means of assessing the influence of post-installed shear reinforcement.
  • PublicationAccès libre
    Effet de l'endommagement sur la résistance au cisaillement des dalles épaisses en béton armé et méthodes de renforcement
    (Regroupement Francophone pour la Recherche et la Formation sur le Béton (RF)²B, 2013-08-22) Fiset, Mathieu; Villemure, Félix-Antoine; Bastien, Josée; Mitchell, Denis; Fournier, Benoit
    Plusieurs phénomènes de dégradations des ouvrages en béton armé sont la cause de déficiences structurales. Les ponts de types dalle épaisse sans armatures de cisaillement sont particulièrement sensibles à la dégradation du béton car ce matériau est le seul pouvant résister aux efforts de cisaillement. Cette recherche porte donc sur l’effet de l’endommagement du béton sur la résistance au cisaillement des dalles épaisses existantes et sur les moyens de les renforcer en cisaillement. Pour y arriver, trois axes de recherche sont étudiés : les effets de l’endommagement et de la réaction alcali-silice sur la résistance au cisaillement du béton, l’effet de l’endommagement du béton sur leur ancrage et les méthodes de postrenforcement. Le type de postrenforcement étudié consiste à installer des barres verticales à l’intérieur d’ouvertures percées dans la dalle et d’y ancrer des renforcements selon différentes méthodes : ancrage époxydique, ancrage mécanique interne ou externe.
  • PublicationAccès libre
    Renforcement en cisaillement des dalles épaisses en béton armé : étude expérimentale et numérique
    (2012-07-05) Jolin, Marc; Fiset, Mathieu; Mitchell, Denis; Bastien, Josée
    Le système structural de plusieurs ponts peut être associé à dalle épaisse en béton armé. Avec l’augmentation des charges routières ainsi que la dégradation des matériaux, certains de ces ouvrages doivent maintenant être renforcés en cisaillement. Le but de ce projet est d’étudier le comportement des dalles épaisses renforcées par divers types de renforcements et de déterminer une méthode de calcul de ce renforcement. La méthode de renforcement étudiée consiste à percer une ouverture verticale dans la dalle, y insérer une barre d’armature et la retenir par différentes méthodes d’ancrage. Les premiers résultats expérimentaux montrent que le renforcement d’une dalle peut accroître sa résistance en cisaillement de 49%. L’outil d’analyse par éléments finis Vector2 va permettre d’étudier les principaux paramètres influençant le comportement des dalles. Les premiers résultats expérimentaux ainsi que les modèles numériques y étant liés sont présentés.
  • PublicationAccès libre
    Post-installed shear reinforcement for concrete thick slabs
    (KIT Scientific Publishing, 2012-07-22) Fiset, Mathieu; Bastien, Josée; Mitchell, Denis
    Many concrete bridges may be associated to a simple thick slabs structural system. With the increase in traffic loads and material degradation, some of these structures need to be strengthened in shear. The goal of this research is to study the behaviour of slabs strengthened with post-installed shear reinforcement and to provide an analytical method of design. The studied reinforcement methods consist in installing rebars into pre-drilled holes in the slab with different anchor systems. The first experimental results showed that shear-strengthened slabs can have failure loads 46% higher than an unstrengthened slab but 29% lower than the Canadian code prediction for conventional stirrups. The VecTor2 finite element analysis tool will be used to study the parameters influencing the slabs behaviour. The first experimental results and associated numerical models outcomes will be presented.
  • PublicationAccès libre
    Methods for shear strengthening of thick concrete slabs
    (American Society of Civil Engineers, 2016-10-31) Fiset, Mathieu; Bastien, Josée; Mitchell, Denis
    This paper presents different strengthening techniques to improve the shear capacity of existing thick concrete slab structures that were constructed without shear reinforcement. Reinforcing bars are installed into vertical drilled holes and anchored with epoxy adhesive to increase the shear capacity. Experiments on retrofitted beams, representing slab strips, showed that all of the strengthening techniques investigated resulted in increased shear capacities. The shear failure mechanisms of the strengthened beams showed that, as expected, current evaluation methods for elements with conventional, well-anchored stirrups can lead to an overestimation of the shear capacities. The efficiency of the strengthening techniques is strongly influenced by the performance of the end anchorage of the drilled-in bars. The effectiveness of the epoxy-bonded bars is a function of their embedded length and they can, in some cases, debond before they reach their yield strength. By using the maximum bar spacing required by the Canadian design code for bridges or the AASHTO-LRFD design specifications, bonded shear-reinforcing bars may debond and offer poor performance. A maximum transverse reinforcement spacing criterion is therefore suggested for the added bonded bars.
  • PublicationAccès libre
    Drilled-in shear reinforcement for concrete thick slabs : modelling aspects
    (CRIB, Université Laval, 2014-07-21) Fiset, Mathieu; Bastien, Josée; Mitchell, Denis
    In order to evaluate the performance of drilled-in bonded shear reinforcement, two series of largescale slabs were tested before and after shear strengthening. Experimental results indicate that the 2006 Canadian Standard and the 2010 fib Model Code provisions overestimate the shear strength of such strengthened slabs by about 29% if the drilled-in shear reinforcement is assumed to be totally effective. The main goal of this research is to develop a method for predicting the shear strength of slabs with bonded shear reinforcement. A non-linear finite element model using the program VecTor2 was used to study parameters influencing the slab behaviour up to failure. Results showed that both the behaviour and ultimate strength of slabs are predicted well by the model while taking account of a stress-slip relationship for the bonded reinforcing bars. Moreover, the experimental observations during the loading corroborate the cracking pattern predictions.
  • PublicationAccès libre
    Behaviour of thick concrete members with unbonded transverse reinforcement
    (International Federation for Structural Concrete, 2016-08-29) Fiset, Mathieu; Parenteau, Alexandra; Bastien, Josée; Bilodeau, Sébastien; Mitchell, Denis
    One commonly used method to increase the shear capacity of existing concrete structures consists of adding vertical steel bars anchored to the structure by means of mechanical anchorages, such as expansion torque controlled anchorages or steel anchorage plates. If the drilled holes are not filled with adhesive then the bars are unbonded along their length. In order to study the behaviour of concrete members with unbonded transverse reinforcement, thick concrete beams (width of 610 mm and height of 750 mm) were loaded until shear failure. It has been observed that their shear capacity is closely related to the shear cracking behaviour. At shear cracking, the propagation of one large diagonal crack is required to activate the vertical unbonded bars, thereby reducing the aggregate interlock shear capacity along the cracks. Beams containing at least minimum amounts of conventional stirrups experience several diagonal cracks at shear failure, whereas a beam with unbonded bars tends to have one dominant crack and can therefore experience the size effect in shear. A finite element (FE) model was also used to study the parameters influencing the behaviour of concrete members with unbonded transverse bars. The finite element results show very good agreement with the experimental results.