Strain fields and damage evolution in concrete during a pullout test

Orit Leibovich, David Z. Yankelevsky, Avraham N. Dancygier

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

RC is based on the bond between rebar and the surrounding concrete. Studies on bond are commonly done through pullout tests, where the applied load and the slip are recorded. Bond in deformed rebars is based on a mechanical interaction between the ribs and the concrete. This research aims at summarizing several research steps aiming at gaining insight and a better understanding of the mechanisms governing the rebar-concrete bond at the local level. Special effort was made to investigate the local behaviour, utilizing a new experimental method based on a standard experimental setup with a cylinder specimen in which a "window" was opened. Comparisons between the load-slip relationships of the standard and the "window" specimens showed good correspondence. The "window" enables direct and continuous photography of the concrete near the rebar during a pullout experiment. Integration of a photographic technique and image correlation analysis enables the transformation of the digital images into displacement and strain fields and allows following the development of local cracking even before cracks can be visually identified. Development of increased shear strains in a limited volume of concrete around the rebar that participates in the pullout load transfer mechanism has been identified, while the surrounding concrete develops a “ring action”. The information and insights obtained in this study were not available before. Further research will enable the qualitative and quantitative understanding of the local interaction.

Original languageEnglish
Title of host publicationConcrete Innovations in Materials, Design and Structures - Proceedings of the fib Symposium, 2019
EditorsWit Derkowski, Piotr Gwozdziewicz, Lukasz Hojdys, Piotr Krajewski, Marek Pantak
Publisherfib. The International Federation for Structural Concrete
Pages552-559
Number of pages8
ISBN (Print)9782940643004
StatePublished - 2019
EventInternational fib Symposium on Concrete Innovations in Materials, Design and Structures, 2019 - Kraków, Poland
Duration: 27 May 201929 May 2019

Publication series

Namefib Symposium

Conference

ConferenceInternational fib Symposium on Concrete Innovations in Materials, Design and Structures, 2019
Country/TerritoryPoland
CityKraków
Period27/05/1929/05/19

Keywords

  • Bond
  • Image correlation
  • Rebar-concrete interaction
  • Strain
  • Testing technique

All Science Journal Classification (ASJC) codes

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

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