PSI - Issue 44

Matteo Canestri et al. / Procedia Structural Integrity 44 (2023) 2198–2205 Canestri et al./ Structural Integrity Procedia 00 (2022) 000–000

2202

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the higher the number of layers, the higher the strength increment observed. Small differences were noticed between samples with one reinforcing layer and different overlapping lengths.

Table 2. Experimental results of compression tests Sample name Maximum Load (kN) Peak stress (MPa)

ε v at peak (%)

ε h at peak (%)

Strength increment ( % )

C_URM C_1L_1 C_1L_2 C_2L_1 C_2L_2 C_3L_1 C_3L_2

568.0 631.4 676.1 653.0 733.5 699.3 809.1 739.0

9.087

0.403 0.529 0.608 0.538 0.689 0.796 0.646 0.859

1.156 0.369 0.484 1.231 1.439 1.295 0.415 0.692

10.184 10.775 10.448 11.878 11.416 12.998 12.065

+12.07% +18.58% +14.98% +30.71% +25.63% +43.04% +32.77%

C_1L_MOD

Axial stress vs vertical deformation curves are reported in Fig. 4 a for all the tested specimens, while axial stress vs horizontal (lateral) deformation are depicted in Fig. 4 b . Curves related to samples with the same number of SRG reinforcing layers showed similar behaviors. It should be noted that vertical deformations at conventional failure, defined as described in Chapter 2.3, progressively increased with the number of layers. On the other hand, horizontal deformations at peak were more scattered, with higher values for samples reinforced with 2 layers.

Fig. 4. Uniaxial compression test results: (a) axial stress vs vertical deformation; (b) axial stress vs horizontal deformation.

Fig. 5. Representative failure modes: (a) C_URM; (b) C_1L_2; (c) C_2L_1; (d) C_3L_2.