American Society of Civil Engineers


Nonlinear Behavior of a Masonry Subassemblage Before and After Strengthening with Inorganic Matrix-Grid Composites


by F. Parisi, (corresponding author), (Ph.D. Candidate in Seismic Risk, Dept. of Structural Engineering, Univ. of Naples Federico II, Via Claudio 21, P.O. Box I-80125, Naples, Italy. E-mail: fulvio.parisi@unina.it), G. P. Lignola, (Assistant Professor, Structural Engineering, Dept. of Structural Engineering, Univ. of Naples Federico II, Via Claudio 21, P.O. Box I-80125, Naples, Italy. E-mail: glignola@unina.it), N. Augenti, (Associate Professor of Structural Engineering, Dept. of Structural Engineering, Univ. of Naples Federico II, Via Claudio 21, P.O. Box I-80125, Naples, Italy. E-mail: augenti@unina.it), A. Prota, (Assistant Professor, Structural Engineering, Dept. of Structural Engineering, Univ. of Naples Federico II, Via Claudio 21, P.O. Box I-80125, Naples, Italy. E-mail: aprota@unina.it), and G. Manfredi, (Full Professor of Structural Engineering, Dept. of Structural Engineering, Univ. of Naples Federico II, Via Claudio 21, P.O. Box I-80125, Naples, Italy. E-mail: gamanfre@unina.it)

Journal of Composites for Construction, Vol. 15, No. 5, September/October 2011, pp. 821-832, (doi:  http://dx.doi.org/10.1061/(ASCE)CC.1943-5614.0000203)

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Document type: Journal Paper
Abstract: Past experimental tests on a full-scale masonry wall with an opening evidenced the key role of the spandrel panel in the in-plane nonlinear response of the system. Recent seismic codes do not provide specific criteria to assess and to strengthen existing masonry spandrel panels with inorganic matrix-grid (IMG) composites. Numerical finite-element (FE) analyses are used to deepen the knowledge about the nonlinear response of masonry walls and the role of the IMG strengthening system. The comparison of experimental and numerical results contributes to the development of a simplified analytical model to assess the influence of the external reinforcement system on the in-plane seismic response of masonry wall systems. Some hints about the strengthening design that could change the failure mode from brittle shear to ductile flexure are given. Finally, a further enhancement of the IMG strengthening system is proposed to avoid the undesirable splitting phenomena attributable to compression forces and to exploit the full compressive strength of masonry against bending moments.


ASCE Subject Headings:
Masonry
Walls
Rehabilitation
Composite materials
Finite element method
Nonlinear analysis
Seismic design
Full-scale tests

Author Keywords:
Masonry
Walls
Rehabilitation
Composite materials
Finite element method
Nonlinear analysis
Seismic design
Full-scale tests