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

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Title: Development of an interface numerical model for C-FRPs applied on flat and curved masonry pillars.
Authors: Milani, Gabriele1 (AUTHOR) gabriele.milani@polimi.it, Fagone, Mario2 (AUTHOR), Rotunno, Tommaso3 (AUTHOR), Grande, Ernesto4 (AUTHOR), Bertolesi, Elisa5 (AUTHOR)
Source: Composite Structures. Jun2020, Vol. 241, pN.PAG-N.PAG. 1p.
Subjects: Masonry, Boundary value problems, Finite differences, Interfacial stresses
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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
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. [ABSTRACT FROM AUTHOR]
ISSN:02638223
DOI:10.1016/j.compstruct.2020.112074