Garofano, Angelo (2013) The Application of Composite Materials for the Reduction of the Seismic Vulnerability of Masonry Buildings. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: The Application of Composite Materials for the Reduction of the Seismic Vulnerability of Masonry Buildings.
Creators:
CreatorsEmail
Garofano, Angeloa.garofano@unisannio.it
Date: 31 March 2013
Number of Pages: 358
Institution: Università degli Studi di Napoli Federico II
Department: Scienze fisiche
Scuola di dottorato: Scienze fisiche
Dottorato: Rischio sismico
Ciclo di dottorato: 25
Coordinatore del Corso di dottorato:
nomeemail
Zollo, Aldoaldo.zollo@unina.it
Tutor:
nomeemail
Ceroni, Francescaceroni@unisannio.it
Pecce, Maria Rosariapecce@unisannio.it
Date: 31 March 2013
Number of Pages: 358
Uncontrolled Keywords: frp grid reinforcement, in-plane strengthening, masonry modelling, non-linear behaviour, seismic vulnerability.
Settori scientifico-disciplinari del MIUR: Area 08 - Ingegneria civile e Architettura > ICAR/09 - Tecnica delle costruzioni
Date Deposited: 06 Apr 2013 09:01
Last Modified: 23 Jul 2014 07:24
URI: http://www.fedoa.unina.it/id/eprint/9184
DOI: 10.6092/UNINA/FEDOA/9184

Abstract

Masonry buildings, whether ordinary or monumental, represent a particular class of buildings characterized by high vulnerability with respect to actions induced by earthquakes. In the last decades several studies have been carried out about the seismic behaviour of masonry buildings, but still many open issue exist regarding assessment methods, strengthening techniques, availability of adequate reinforcement design standards. The damage experienced by masonry elements has brought to light the necessity to strengthen them with appropriate reinforcing systems in order to achieve the upgrading to the necessary seismic and energy dissipation capacity. The strengthening method characterized by the application of composite grid reinforced mortar layers onto the surface of masonry walls was recently introduced and still requires deep experimental and numerical investigation. This system represents an alternative technique of increasing the load-carrying and deformation capacity of unreinforced masonry walls subjected to cyclic loads and combines the advantages of both traditional and innovative types of intervention, being the composite a high performance material and the mortar a compatible material with respect to the masonry substrate. The present research focuses on the study of the behaviour of masonry walls strengthened by the described technique. The overall ductility and energy dissipation capacity of the system, when subjected to horizontal in-plane actions, is studied. The actual mechanical behaviour of the proposed structural solution is investigated through an experimental program with prototypes. Moreover, the numerical modelling of the masonry walls unreinforced and reinforced by the mortar layers with the composite grids is performed with the aim to define the effectiveness of the strengthening technique in the upgrading and retrofitting of the overall behaviour of masonry walls with respect to the in-plane shear resistance and global ductility. The results of several parametric analyses are presented and discussed, evidencing the effect of the reinforcement on the strength and displacement capacity of the wall. Two types of masonry (adobe brick and tuff block masonry) and three values of shape factor (1.0, 1.3 and 2.0) were considered. The influence of mechanical parameters of the strengthening system related to the compressive strength of the mortar layer and the axial stiffness of the composite grid in terms of variation with respect to the plane masonry wall is investigated. Finally, the intervention of strengthening of a historical masonry palace by means of this technique is described.

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