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Reinforced-Concrete Beams Retrofitted in Shear With Externally-Bonded Fibre-Reinforced Polymer: Development of a Design Model

Lookup NU author(s): Dr Amir MofidiORCiD


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This paper presents the results of a theoretical study of the parameters that affect the contribution of fibre-reinforced polymer (FRP) composite to the shear resistance of reinforced concrete (RC) beams retrofitted in shear. To assess and analyse the variables that have the most signifi cant effect on the shear resistance of RC members strengthened with externally-bonded (EB) FRP, the results of available studies reported in the literature are used. In addition to variables related to the mechanical properties of FRP and internal transverse steel reinforcement, the following influential parameters on the shear contribution of FRP are assessed in this study: (i) the shear span ratio; (ii) the longitudinal-steel reinforcement ratio; (iii) the compressive strength of concrete; and (iv) the failure mode of RC beams shear-strengthened with EB FRP. This study shows that the effect of steel stirrups on the shear contribution of FRP is significant. However, the steel stirrups effect is not taken into consideration in existing codes and guidelines. In this paper, a design method is proposed that considers the effect of steel stirrups in addition to other influential parameters on the contribution of FRP to the shear resistance. Comparison with current design guidelines reveals that the proposed model achieves a better correlation with experimental results than current design codes and guidelines.

Publication metadata

Author(s): Mofidi A, Chaallal O

Publication type: Article

Publication status: Published

Journal: Australian Journal of Structural Engineering

Year: 2014

Volume: 15

Issue: 4

Pages: 407-417

Print publication date: 01/10/2014

Online publication date: 16/11/2015

Acceptance date: 02/06/2014

ISSN (print): 1328-7982

ISSN (electronic): 2204-2261

Publisher: Institution of Engineers Australia


DOI: 10.7158/S13-037.2014.15.4.


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