Development of an interface numerical model for C-FRPs applied on flat and curved masonry pillars

• Published in: Composite structures Vol. 241; p. 112074
• Main Authors: Milani, Gabriele, Fagone, Mario, Rotunno, Tommaso, Grande, Ernesto, Bertolesi, Elisa
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2020
• Subjects: Arches and vaults; C-C-FRP reinforcement; Curved substrates; Debonding; Masonry; Non-linear boundary value problem for ODEs; Curved substrates; Debonding; Masonry; C-C-FRP reinforcement; Non-linear boundary value problem for ODEs; Arches and vaults
• ISSN: 0263-8223; 1879-1085
• DOI: 10.1016/j.compstruct.2020.112074

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.