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Conference paper

The Relationship between Rebar-Debonding and Cracking in Reinforced Concrete

In Proceedings of the Fib Symposium: Concrete Structures for Sustainable Community — 2012

By Thybo, Anna Emilie A.1,2; Stang, Henrik1,2; Olesen, John Forbes1,2

From

Department of Civil Engineering, Technical University of Denmark1

Section for Structural Engineering, Department of Civil Engineering, Technical University of Denmark2

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.

Language: English
Year: 2012
Proceedings: fib Symposium
Types: Conference paper
ORCIDs: Stang, Henrik and Olesen, John Forbes
Keywords

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

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