Bond Behavior of TRM Systems and Reinforcement of Masonry Arches: Testing and Modelling

Abstract

The paper addresses the results of experimental and analytical investigations on composite systems able to reduce structural vulnerability of arches. Two composites, consisting of a PBO (propylbenzodioxole) fibre textile or a carbon fibre textile coupled with a cement-based matrix, are considered. Experimental results on bond capacity between composites and bricks and on the structural behaviour of unreinforced and extrados-reinforced 1:2 scale masonry arches, tested under vertical load, are presented. The global load slip law deduced from double-shear tests is employed to predict the load displacement path followed by an arch reinforced at the extrados through the two composites. The analytical model, which exploits stationarity of potential energy of acting forces, is validated through the experimental results on the reinforced reduced scale arch. Results show how the initial response is tackled by the model. The procedure could be refined and extended to other curved elements (e.g. pointed and ogee arches, vaults and domes) and loading conditions. A further improvement may come from the use of test results on convex surfaces, it being known that the bonding behaviour is improved with respect to that on plane surfaces.

Limit analysis of locally reinforced masonry arches

“…TRM by Misseri et al [33]. They found that the CFRP reinforced arches had a strength 10 times higher than the unreinforced arches whereas that the PBO TRM reinforced arches achieved a strength increment of 5 times.…”

Experimental, analytical, and numerical investigations on bond behaviour of basalt TRM systems

“…First developed as fibre reinforced polymers (FRP) in other branches of applied technologies, lately, they have been introduced in the construction field (Kouris and Triantafillou, 2018;Gattesco and Boem, 2019). To overcome some significant drawbacks caused by the organic binder of FRP matrices -namely low resistance to high temperature, low vapour permeability and failure by delamination from the substrate, fibre reinforced cementitious mortars (FRCM) have been developed using loose mesh textiles and cement or lime-based mortars (Briccoli Bati et al, 2007;Rovero et al, 2013;Rotunno et al, 2015;Alecci et al, 2016;Misseri et al, 2019aMisseri et al, , 2019bKumar et al, 2019;Barducci et al, 2020;Misseri et al, 2020;Padalu et al, 2020;Boem and Gattesco, 2021), which ensure better compatibility with the masonry substrate. Gypsum based mortars proved also effective (Rovero et al, 2020;Misseri et al, 2021).…”