Development of an interface numerical model for C-FRPs applied on flat and curved masonry pillars. (1st June 2020)

• Record Type: Journal Article
• Authors: Milani, Gabriele; Fagone, Mario; Rotunno, Tommaso; Grande, Ernesto; Bertolesi, Elisa
• Is Part Of: Composite structures. Volume 241(2020)
• Publication Date: 2020-06-01
• Subjects: Masonry -- Arches and vaults -- C-C-FRP reinforcement -- Non-linear boundary value problem for ODEs -- Debonding -- Curved substrates; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2020.112074
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: A novel interface numerical model for the incremental analysis of the debonding phenomenon of Carbon Fiber Reinforced Polymer (C-FRP) reinforcements externally applied on flat and curved masonry pillars is presented. The interface tangential stress-slip behavior is suitably described by a C ∞ exponential function, that accounts for the ductility and residual strength variation due to the presence of interfacial normal stresses, according to a frictional-cohesive relationship. Such dependence is particularly important when dealing with C-FRP reinforcements applied to masonry curved structures (i.e. arches and vaults). The smooth interface relationship here adopted allows to deal with a boundary value problem for a system of second order differential equations, representing a standard delamination problem, without singularities. Consequently, an easy and robust numerical solution algorithm based on a standard finite differences approach can be adopted. The model is validated against some experimental and numerical results obtained previously by the authors and concerning shear-lap bond tests of flat and curved masonry pillars reinforced by C-FRP sheets. The obtained results underline an excellent robustness and reliability of the experimental global and local behavior.