The Relationship between Rebar-Debonding and Cracking in Reinforced Concrete

Anna Emilie A. Thybo, Henrik Stang, John Forbes Olesen

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Abstract

A mechanical model has been used to evaluate the rebar-concrete debonding length and Crack Mouth Opening Displacement (CMOD) in reinforced concrete. The modelling is based on the theory of the fictitious crack. It is shown that there is a non-trival relationship between the debonding length and the CMOD, indicating that if the debonding length has a significant influence on the risk of corrosion initiation and propagation (as indicated in the literature), then CMOD cannot be used alone as corrosion risk indicator. A limited parametric study has been performed and it has been shown that the shear strength of the interface has a significant influence on the debonding length. The cover layer – on the other hand – has relatively little influence on the debonding lengths.
Original languageEnglish
Title of host publicationProceedings of the fib Symposium: Concrete Structures for Sustainable Community
Number of pages4
Publication date2012
Publication statusPublished - 2012
Eventfib Symposium: Concrete Structures for Sustainable Community - Royal Institute of Technology (KTH) , Stockholm, Sweden
Duration: 11 Jun 201214 Jun 2012
http://www.fibstockholm2012.se/

Conference

Conferencefib Symposium
LocationRoyal Institute of Technology (KTH)
CountrySweden
CityStockholm
Period11/06/201214/06/2012
Internet address

Keywords

  • Theory of the fictitious crack
  • Debonding length
  • CMOD
  • Finite Element Modelling
  • Reinforced concrete
  • Three-point bending

Cite this

Thybo, A. E. A., Stang, H., & Olesen, J. F. (2012). The Relationship between Rebar-Debonding and Cracking in Reinforced Concrete. In Proceedings of the fib Symposium: Concrete Structures for Sustainable Community