An Updated Discrete Element Model for the In-Plane Behaviour of NFRCM Strengthened Masonry Walls

Abstract:

Abstract. Masonry strengthened with natural fabric-reinforced cementitious matrix (NFRCM-strengthened masonry) is investigated by updating an existing discrete element model. Masonry walls are modelled by rigid blocks and elastoplastic interfaces that are able to account for mortar joints and block cracking. The reinforcement is modelled in a simplified manner considering perfect adhesion between wall and reinforcement and by adopting further spring elements connecting block centres. The model is validated by comparing it with an existing FEM based on a multi-step homogenization, where reinforced masonry is considered as a whole. Both approaches are used for performing nonlinear pushover tests with an increasing shear action applied to unreinforced and reinforced panels. The updated discrete model turns out to be able to represent the strength increment given by the reinforcement, but it is less able to represent the corresponding ductility increment.

• Periodical: Key Engineering Materials (Volume 916)
• Pages: 249-255
• DOI: https://doi.org/10.4028/p-1853qe
• Online since: April 2022
• Authors: Daniele Baraldi*, Giosuè Boscato, Antonella Cecchi, Claudia Brito de Carvalho Bello
• Keywords: Discrete Element Model, FRCM, Homogenized FE Model, Masonry Strengthening, Natural Fibers, Shear Test

References

[1] A. di Tommaso, F. Focacci, F. Micelli, Strengthening historical masonry with FRP or FRCM: Trends in design approach, Key Eng. Mater. 747 (2017) 166-173.

DOI: 10.4028/www.scientific.net/kem.747.166

[2] C.B. de Carvalho Bello, A. Cecchi, E. Meroi, D.V. Oliveira, Experimental and Numerical Investigations on the Behaviour of Masonry Walls Reinforced with an Innovative Sisal FRCM System, Key Eng. Mater. 747 (2017) 190‐195.

DOI: 10.4028/www.scientific.net/kem.747.190

[3] X. Wang, B. Ghiassi, D.V. Oliveira, C.C. Lam, Modelling the Nonlinear Behaviour of Masonry Walls Strengthened with Textile Reinforced Mortars, Eng. Struct. 134 (2017) 11‐24.

DOI: 10.1016/j.engstruct.2016.12.029

[4] C.B. de Carvalho Bello, D. Baraldi, G. Boscato, A. Cecchi, O. Mazzarella, E. Meroi, I. Aldreghetti, G. Costantini, L. Massaria, V. Scafuri, I. Tofani, Numerical and theoretical models for NFRCM-strengthened masonry, Key Eng. Mater. 817 (2019) 44-49.

DOI: 10.4028/www.scientific.net/kem.817.44

[5] D. Baraldi, C.B. De Carvalho Bello, A. Cecchi, Refined Rigid Block Model for In-Plane Loaded Masonry, Adv. Civil Eng. (2020) 8844759.

DOI: 10.1155/2020/8844759

[6] D. Baraldi, G. Boscato, C.B. De Carvalho Bello, A. Cecchi, E. Reccia, Discrete and Finite Element Models for the Analysis of Unreinforced and Partially Reinforced Masonry Arches, Key Eng. Mater. 817 (2019) 229-235.

DOI: 10.4028/www.scientific.net/kem.817.229

[7] A. Cecchi, G. Milani, A. Tralli, In-Plane Loaded CFRP Reinforced Masonry Walls: Mechanical Characteristics by Homogenisation Procedures, J. Compos. Sci. Tech. 64 (2004) 2097-2112.

DOI: 10.1016/j.compscitech.2004.03.009

[8] TNO DIANA, DIANA. DIsplacement method ANAlyser, release 9.4, User's Manual, (2010).

[9] M. Angelillo, P.B. Lourenço, G. Milani, Masonry behaviour and modelling, Mechanics of Masonry Structures, CISM International Centre for Mechanical Sciences, 2014, p.1–26.

DOI: 10.1007/978-3-7091-1774-3_1

[10] C.B. de Carvalho Bello, I. Boem, A.Cecchi, N. Gattesco, D. V. Oliveira, Experimental tests for the characterization of sisal fiber reinforced cementitious matrix for strengthening masonry structures, Constr. Build. Mat. 219 (2019) 44-55.

DOI: 10.1016/j.conbuildmat.2019.05.168

[11] P.B. Lourenço, J.G. Rots, Multisurface interface model for analysis of masonry structures, J. Eng. Mech. 123 (1997) 660–668.

DOI: 10.1061/(asce)0733-9399(1997)123:7(660)

[12] C.B. de Carvalho Bello, D. Baraldi, A. Cecchi, D.V. Oliveira, Experimental Characterization of Masonry Panels Strengthened with NFRCM, Key Eng. Mater. 898 (2021) 43-48.

DOI: 10.4028/www.scientific.net/kem.898.43