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Methods for shear strengthening of thick concrete slabs

Fiset Mathieu, Bastien Josée et Mitchell Denis. (2017). Methods for shear strengthening of thick concrete slabs. Journal of Performance of Constructed Facilities, 31, (3), p. 1-10.

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URL officielle: http://dx.doi.org/10.1061/(ASCE)CF.1943-5509.00009...

Résumé

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.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:31
Numéro:3
Pages:p. 1-10
Version évaluée par les pairs:Oui
Date:2017
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie civil
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées
Mots-clés:concrete slabs, shear strength of soils, reinforcing bars, bridge design & construction, epoxy compounds, dalles de béton, résistance au cisaillement des sols, barres d'armature, conception et construction de ponts, composés époxy
Déposé le:11 févr. 2020 23:42
Dernière modification:11 févr. 2023 15:39
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