Numerical simulation of bond-slip interface and tension stiffening in GFRP RC tensile elements. (1st October 2016)

• Record Type: Journal Article
• Authors: Vilanova, I.; Torres, L.; Baena, M.; Llorens, M.
• Is Part Of: Composite structures. Volume 153(2016)
• Page Start: 504
• Page End: 513
• Publication Date: 2016-10-01
• Subjects: Bond interface -- FRP -- Reinforced concrete -- Interaction -- Pull-out -- Modelling; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2016.06.048
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: Bond between reinforcement and concrete highly affects the structural behaviour of reinforced concrete (RC). Introduction of bond-slip models into numerical simulation allows taking into account the bond interaction and analyse its effect on local and global behaviour. Unlike conventional steel reinforcement, no standard bond-slip law exists for FRP reinforcement, as bond is the result of a combination of parameters such as reinforcing material and bar surface configuration, among others. Therefore, there is a need in developing a methodology to easily implement bond-slip response from experimental bond tests. In this work, a methodology to implement bond-slip behaviour between concrete and reinforcement into a FEM model is presented. The inverse analysis is used to characterise the bond mechanisms active in a pull-out test. The obtained constitutive behaviours are thereafter implemented into a FE program by using connector elements and surface-to-surface contacts, and GFRP RC tensile elements are modelled. Numerical results are compared to experimental ones available in the literature, showing good accuracy in terms of load-deformation, crack width and crack spacing, as well as strains and bond stress and slip distributions along the reinforcing bar.