Concrete damage plasticity model for modeling FRP-to-concrete bond behavior

Y. Tao, J. Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The technique of externally bonding fiber-reinforced polymer (FRP) composites has become very popular worldwide for retrofitting existing reinforced concrete (RC) structures. Debonding of FRP from the concrete substrate is a typical failure mode in such strengthened structures. The bond behavior between FRP and concrete thus plays a crucial role in these structures. The FRP-to-concrete bond behavior has been extensively investigated experimentally, commonly using a single or double shear test of the FRP-to-concrete bonded joint. Comparatively, much less research has been concerned with numerical simulation, chiefly due to difficulties in the accurate modeling of the complex behavior of concrete. This paper presents a simple but robust finite-element (FE) model for simulating the bond behavior in the entire debonding process for the single shear test. A concrete damage plasticity model is proposed to capture the concrete-to-FRP bond behavior. Numerical results are in close agreement with test data, validating the model. In addition to accuracy, the model has two further advantages: it only requires the basic material parameters (i.e., no arbitrary user-defined parameter such as the shear retention factor is required) and it can be directly implemented in the FE software ABAQUS.

Original languageEnglish
Article number04014026
Number of pages13
JournalJournal of Composites for Construction
Volume19
Issue number1
Early online date21 Apr 2014
DOIs
Publication statusPublished - Feb 2015

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Keywords

  • Bond
  • Concrete
  • Damage
  • Fiber-reinforced polymer
  • Finite-element model

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