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Rebar pullout testing under dynamic Hopkinson bar induced impulsive loading

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Abstract

The dynamic behavior of the bond slip between a deformed reinforcing bar and plain concrete has been experimentally investigated by employing Hopkinson bar techniques. Pullout tests with various specimen types (unconfined, confined, cast-in-place, post-installed etc.) have been performed. Pullout of the steel rebar and splitting of the concrete cylinder have been the failure modes induced. Test results comprise peak pullout forces and complete bond stress–slip diagrams. They clearly show that the dynamic pullout forces and curves are well above the static ones, and that the pullout work of bond failure is considerably greater for the dynamic impact loading. Confinement, provided by a steel tube, leads to improved bonding; peak loads increase up to 2.5 times. The effects of bond length and concrete strength have also been put into evidence. Finally it has been verified that post-installed rebars, depending upon the particular adhesive employed, can achieve the same bond resistance as the cast-in-place ones.

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Acknowledgements

This investigation has been performed within the EU project ANCHR (BRPR-CT97-0549) “Anchorages in normal and high performance concretes subjected to medium and high strain rates”. The financial support of the European Commission is kindly acknowledged. The partners of the project consortium were: Densit a/s, Hilti, JRC, ENEL-CRIS (currently partly incorporated under CESI RICERCA), Politecnico di Milano, University of Patras and Bekaert. The authors are thankful to all of them for the fruitful interactions. ENEL-CRIS has also been partially supported by the Research Fund for the Italian Electricity System. Thanks are also extended to Professor R. Eligehausen, University of Stuttgart, for his advice to the JRC work. Finally, the authors especially wish to express their thanks to their colleagues, who have participated and contributed in carrying out the experiments at the respective laboratories.

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Authors and Affiliations

  1. European Commission, Joint Research Centre, Via E. Fermi 2749, 21027, Ispra, Italy

    George Solomos

  2. CESI RICERCA, 20134, Milan, Italy

    Mario Berra

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  1. George Solomos
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  2. Mario Berra
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Correspondence to George Solomos.

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Solomos, G., Berra, M. Rebar pullout testing under dynamic Hopkinson bar induced impulsive loading. Mater Struct 43, 247–260 (2010). https://doi.org/10.1617/s11527-009-9485-z

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