Numerical modeling of Fabric Reinforce Cementitious Matrix composites (FRCM) in tension

Mechanical properties and debonding strength of Fabric Reinforced Cementitious Matrix (FRCM) systems for masonry strengthening

“…This phenomenon is mainly caused by two parameters: the non-regular dimensions of the specimen section (see Table 4) and the location of the first crack with respect to the extensometer [38]. As described in Chapter 2, the extensometer had a length of 100 mm and was located in the central part of the specimens.…”

A qualification method for externally bonded Fibre Reinforced Cementitious Matrix (FRCM) strengthening systems

“…Specimens are clamped in the wedges of a testing machine, such that the applied normal stress avoids sliding in the griping areas, making it possible to derive the whole response curve of the composite up to the tensile rupture of the textile. In order to ensure a homogeneous stress distribution and prevent mortar crushing, either FRP reinforcements [4] or tabs [3] can be applied. This method differs from the clevis-type gripping mechanism recommended by Annex A of US standard AC434 [19], in which the load is transferred from the testing machine to the mortar by adhesion, and failure is expected to occur by textile slipping within the matrix.…”

“…On the one hand, fundamental information has been recently provided by research studies on tensile response [3,4], durability [5], and bond performance on both masonry [6e9] and concrete [10,11] substrates. Moreover, medium/large scale laboratory investigations have clearly shown the effectiveness of mortar-based systems for the strengthening of reinforced concrete beams [12] and masonry arches [13,14], the confinement of columns [15], and the seismic retrofitting of masonry walls towards in-plane [16] and out-of-plane [17,18] loads.…”

Numerical analysis of the load-bearing capacity of brick masonry walls strengthened with textile reinforced mortar and subjected to eccentric compressive loading

“…Similarly, TRM, which is also a composite material, shows a complex structural response [11,12,27]. The compressive behaviour of the TRM is governed by the mortar matrix, whereas the tensile response is influenced by a) the mortar matrix (at low loads, before cracking and mobilising the fibre mesh), b) the fibre grid and c) the adherence between the mortar matrix and the fibre grid (at larger loads, after cracking).…”

“…Typical stress-strain relationships of the TRM in tension are presented in the code ACI 549.4R-13 [28] (Fig. 5.3.2b of this standard) or by Bertolesi et al [27] among others. Figure 3 is a sketch of the characteristic experimental response of the TRM under tensile forces.…”