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Title: Behavior of Post-Installed Bonded Bars as Shear Reinforcement

Author(s): Mathieu Fiset, Félix-Antoine Villemure, Josée Bastien, and Denis Mitchell

Publication: Structural Journal

Volume: 117

Issue: 4

Appears on pages(s): 159-168

Keywords: bond behavior; crack width; epoxy-bonded bar; modeling; shear reinforcement

Date: 7/1/2020

Abstract:
Post-installed epoxy-bonded shear reinforcement is a promising technique to increase shear capacity of reinforced concrete (RC) structures. However, the behavior of epoxy-bonded bars largely affects the shear strengthening efficiency. To better predict the behavior of epoxy-bonded bars, a bond model is developed in this paper. This model appears to adequately predict the behavior of epoxy-bonded bars observed in experimental pullout tests and beam loading tests. Based on numerical results, a simplified model is proposed to predict the epoxy-bonded bars’ stress according to the crack width. It appears that the behavior of long embedded bars is similar to stirrups in terms of crack width and bar stress. However, a large diagonal crack is required to reach the bar yielding strength when the bar embedment length is below a transition length, which differs from stirrups. Embedment length below the epoxy-bonded bar development length leads to pullout failure and bar capacity lower than the bar yielding strength.




  

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