Modelling Static and Dynamic FRP-Concrete Bond Behaviour Using a Local Concrete Damage Model

Xiaoqin Li, Jian-Fei Chen*, Yong Lu, Zhenjun Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a study on the bond behaviour of FRP-concrete bonded joints under static and dynamic loadings, by developing a meso-scale finite element model using the K&C concrete damage model in LS-DYNA. A significant number of single shear experiments under static pull-off loading were modelled with an extensive parametric study covering key factors in the K&C model, including the crack band width, the compressive fracture energy and the shear dilatation factor. It is demonstrated that the developed model can satisfactorily simulate the static debonding behaviour, in terms of mesh objectivity, the load-carrying capacity and the local bond-slip behaviour, provided that proper consideration is given to the selection of crack band width and shear dilatation factor. A preliminary study of the effect of the dynamic loading rate on the debonding behaviour was also conducted by considering a dynamic increase factor (DIF) for the concrete strength as a function of strain rate. It is shown that a higher loading rate leads to a higher load-carrying capacity, a longer effective bond length, and a larger damaged area of concrete in the single shear loading scenario.

Original languageEnglish
Pages (from-to)45-58
Number of pages14
JournalAdvances in Structural Engineering
Volume18
Issue number1
Publication statusPublished - Jan 2015

Keywords

  • FRP-concrete bond
  • K&C concrete damage model
  • localization
  • dilatation
  • dynamic increasing factor (DIF)
  • loading rates
  • bond test
  • dynamic bond-slip model
  • COMPOSITES
  • STRENGTH
  • FRACTURE
  • JOINTS

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