Title: Bond behaviour of FRP strengthening applied on curved masonry substrates: numerical study

Authors: Ernesto Grande; Gabriele Milani; Antonio Formisano; Bahman Ghiassi; Francesco Fabbrocino

Addresses: Department of Sustainability Engineering, University Guglielmo Marconi, Via Plinio 44, 00193 Roma, Italy ' Department of Architecture, Built Environment and Construction Engineering (ABC), Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy ' Department of Structures for Engineering and Architecture, University of Naples Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy ' Centre for Structural Engineering and Informatics, Faculty of Engineering, University of Nottingham, NG7-2RD, Nottingham, UK ' Department of Engineering, Pegaso Telematics University, Piazza Trieste e Trento 48, 80132 Napoli, Italy

Abstract: Aim of the present paper is to numerically investigate the bond behaviour of FRP strengthening systems externally applied on curved masonry specimens. In particular, considering the simple spring-model approach proposed by the authors in previous research, a new constitutive law derived from the work of Thorenfeld et al. (1987) is here proposed by also considering the coupled behaviour between shear and normal forces at the reinforcement/masonry interface. Numerical analyses are developed with reference to case studies deduced from the literature and consisting of shear lap bond tests of curved masonry specimens characterised by different values of the geometric curvature and different strengthening configurations. The obtained results show the ability of the proposed modelling approach in capturing some effects, such as the beneficial friction effect when compression normal stresses develop at the interface level.

Keywords: debonding; masonry curved structures; fibre reinforced polymers; FRP; spring-model.

DOI: 10.1504/IJMRI.2020.107980

International Journal of Masonry Research and Innovation, 2020 Vol.5 No.3, pp.303 - 320

Received: 13 Dec 2018
Accepted: 26 Mar 2019
Published online: 01 Jul 2020 *

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