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Debonding Analysis of Fibre Reinforced Polymer Anchors in Concrete via In-Situ X-Ray Microtomography Tests Coupled to Volume and Digital Image Correlation

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Abstract

Background

Externally Bonded (EB) Fibre Reinforced Polymer (FRP) strengthening systems are effective solutions for enhancing structural members’ flexural behaviour. However, some issues are encountered near joints, where the stress transfer between concrete and FRP can be sub-optimal.

Objective

In this work, we aim at bringing understanding through a novel test set-up of the mechanical interaction between concrete and Carbon Fiber Reinforced Polymer (CFRP) anchorage systems in the framework of the flexural strengthening of reinforced concrete (RC) joints.

Methods

The investigation has been carried out on small scale beams with variable cross-sections representative of FRP strengthened joints and subjected to a bending loading. Material degradation and anchor pull-out are tracked thanks to 3D tomography and Digital Volume Correlation (DVC).

Results

The accurate reconstruction of the 3D kinematics in the anchorage region provides a better understanding of the physical phenomena involving CFRP strengthened joints and gives useful information for the development of dedicated numerical models. The knowledge of material evolution during the entire loading history leads to the identification of the relevant mechanisms responsible for reducing the structural stiffness up to failure.

Conclusions

Material bulk degradation in small-scale FRP-strengthened concrete joints can be reconstructed thanks to the proposed test set-up. The failure mode in the anchorage region is highly tridimensional and can be interpreted as a modified version of the typical conical failure observed in standard pull-out experiments. The main observation is that mixed-mode interfacial debonding is influenced by inclination and stiffness of the anchor. The analysis also gives the internal forces in concrete (compression) and in the anchor (tension). Thanks to the knowledge of this latter quantity and the anchor slip, the pull-out response has been determined.

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Data Availability

The data that support the findings of this study will be provided on demand.

Notes

  1. From now on, no distinction will be made between the two terms.

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Acknowledgements

The authors wish to express their most grateful thanks to the French National Research Agency (ANR) for the funding of the ILISBAR project (ANR-16-CE22–0002) by which this study has been carried out.

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Author notes

  1. C. Giry and F. Gatuingt contributed equally to this work.

Authors and Affiliations

  1. TMM department, Saint-Gobain Research Paris, 39 Quai Lucien Lefranc, Aubervilliers, 93300, France

    F. Riccardi

  2. Université Paris-Saclay, CentraleSupélec, ENS Paris-Saclay, CNRS, LMPS - Laboratoire de Mécanique Paris-Saclay, 4 Avenue des Sciences, Gif-sur-Yvette, 91190, France

    F. Riccardi, C. Giry & F. Gatuingt

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  1. F. Riccardi
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Correspondence to F. Gatuingt.

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Riccardi, F., Giry, C. & Gatuingt, F. Debonding Analysis of Fibre Reinforced Polymer Anchors in Concrete via In-Situ X-Ray Microtomography Tests Coupled to Volume and Digital Image Correlation. Exp Mech 63, 1067–1083 (2023). https://doi.org/10.1007/s11340-023-00975-6

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