Effect of the fracture energy of the FRP/concrete interfacial behavior on beams strengthened in shear with EB-FRP

Ahmed Godat, Omar Chaallal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The strengthening of concrete structures by means of externally bonded (EB) fiber-reinforced polymers (FRP) is now routinely considered to be an effective method for enhancing the loading capacity of existing structures. However, the debonding failure often governs the behavior of FRP shear-strengthened beams and prevents them from attaining their full load capacity. This paper presents a finite element model that was developed to investigate the FRP/concrete interfacial properties on the performance of FRP shear-strengthened beams. Nonlinear behavior of the plain concrete, steel reinforcing bars, FRP composites and FRP/concrete interface are simulated with appropriate models. Once the accuracy of the numerical model is established, the numerical analysis is carried out to investigate the parameters responsible for characterizing the initiation and propagation of debonding. These are the interfacial stiffness, the interfacial bond strength and the interfacial fracture energy. In this study, the variation of load-deflection relations is considered as a basis for the comparison. Results show that the interfacial stiffness and the bond strength have neglected influence on the behavior of FRP shear-strengthened beams. Furthermore, the interfacial fracture energy is the main parameter among the bond stress-slip model parameters influencing the strengthening performance of FRP shear-strengthened beams in terms of load-deflection relations and ductility.

Original languageEnglish
Title of host publicationA Fracture Approach for FRP-Concrete Structures 2012 - Held at the ACI Spring 2012 Convention
Pages59-68
Number of pages10
Edition286 SP
Publication statusPublished - 2012
Externally publishedYes
EventA Fracture Approach for FRP-Concrete Structures 2012 at the ACI Spring 2012 Convention - Dallas, TX, United States
Duration: Mar 18 2012Mar 22 2012

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number286 SP
ISSN (Print)0193-2527

Conference

ConferenceA Fracture Approach for FRP-Concrete Structures 2012 at the ACI Spring 2012 Convention
Country/TerritoryUnited States
CityDallas, TX
Period3/18/123/22/12

Keywords

  • Finite element model
  • FRP/concrete interface
  • Interfacial fracture energy
  • Reinforced concrete beams
  • Shear strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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