Strengthening of Masonry Structures With Different Cementitious Matrix Composites

Abstract eng:
Seismic risk mitigation of historical masonry buildings comprises a challenge of growing relevance for both scientific research and engineering practice. Especially for buildings of high historical value, retrofitting techniques must be compliant with the basic principles of conservation, i.e. non-invasiveness, reversibility and compatibility. In this perspective, fabric-reinforced cementitious matrices (FRCMs) are becoming increasingly suitable for strengthening of historic masonry constructions in seismic areas, as an alternative to Fiber Reinforced Polymers (FRPs) . Cementitious matrix composites are easy to apply, have a resistance against high temperatures comparable with the support, can be applied to damp surfaces, and have excellent physical–chemical compatibility with the masonry substrates. Furthermore, if compared with FRP composites, FRCM composites permit higher vapor permeability, lower costs, and a complete reversibility of the installation. These qualities assume a major relevance for ancient masonries retrofitting, where both the seismic safety and the conservation criteria need to be met. Although FRCM systems have attracted growing interest in the strengthening of masonry structures, only few experimental studies are still available. In this paper, experimental data from an extensive testing program are presented in order to better understand mechanical behaviour of PBO-FRCM composite and to properly design seismic reinforcements. Specifically, bond performance between bricks masonry and PBO-FRCM composite are investigated through both beam tests and double shear tests. Mechanical behaviour of masonry arches reinforced at intrados and extrados by PBO-FRCM composite are investigated through experimental test on arch models. In particular, six masonry arch models (1:2 scale), both un-strengthened and strengthened at extrados or intrados and subjected to a vertical force, are comprised in the experimental program. Results in terms of load-carrying capacity, post peak behavior and failure mechanism were reported and commented. The laboratory data demonstrated that PBO-FRCM composite is an effective solution for the strengthening of masonry members, being able to improve their load-carrying capacity as well as their ductility capacity (specific requirement of the current seismic codes).

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