Influence of bond deterioration on the flexural response of FRP strengthened RC beams

Gravina, R, Aydin, H and Visintin, P 2018, 'Influence of bond deterioration on the flexural response of FRP strengthened RC beams', in Emmanuel Ferrier, Karim Benzarti, Jean-François Caron (ed.) Proceedings of the 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE 2018), Paris, France, 17-19 July 2018, pp. 603-611.


Document type: Conference Paper
Collection: Conference Papers

Title Influence of bond deterioration on the flexural response of FRP strengthened RC beams
Author(s) Gravina, R
Aydin, H
Visintin, P
Year 2018
Conference name International Conference on FRP Composites in Civil Engineering
Conference location Paris, France
Conference dates 17-19 July 2018
Proceedings title Proceedings of the 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE 2018)
Editor(s) Emmanuel Ferrier, Karim Benzarti, Jean-François Caron
Publisher International Institute for FRP in construction
Place of publication Paris, France
Start page 603
End page 611
Total pages 9
Abstract Bonding fibre-reinforced polymer (FRP) composites to tensile faces of deficient concrete structures as a means of increase loading capacities and prolonging service life is now common practice. Although FRP application for flexural strengthening is widespread, there is uncertainty surrounding the long-term durability of these strengthening systems. Unlike conventional reinforced concrete flexural members, which are designed to fail in a ductile manner, that is steel yielding followed by concrete crushing, FRP-strengthened member are susceptible to brittle debonding failures. The focus of this study is on intermediate-crack (IC) debonding which is typically isolated by means of shear bond tests. In this paper, a previously developed partial-interaction moment-rotation approach for IC debonding is applied to sets of experimental data in published literature to extract bond characteristics from the FRP-to-concrete interface. The bond characteristics are extracted from deteriorated members to assess the changes at the bond level and are compared with predictions from existing bond-slip models for deteriorated joints. Using the approach, it is found that the environmental loading of FRP-strengthened flexural members generally reduces both the maximum bond stress the slip necessary to initiate IC debonding, thereby compromising the ductility and strength of the member
Subjects Structural Engineering
Keyword(s) Strengthening and repair
modelling
durability
long-term performance
bond and interfacial stresses
reinforced concrete
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