PSI - Issue 44

P. Morandi et al. / Procedia Structural Integrity 44 (2023) 1060–1067 Author name / Structural Integrity Procedia 00 (2022) 000–000

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mechanisms are depicted in terms of block displacement magnitude, using different colours to highlight the relative displacements of masonry portions.

a)

b)

Fig. 5. Experimental versus numerical hysteresis curves: a) UBPS01; b) RBPS01.

Experimental

Numerical

Experimental

Numerical

a)

b)

Fig. 6. Experimental versus numerical in-plane failure mechanisms: a) UBPS01; b) RBPS01. Black arrows indicate block relative shear displacements.

In Table 3 a comparison between the experimental and numerical main parameters is reported. In particular, the considered parameters are the elastic stiffness k el , the maximum absolute shear V max , the drift ratio θ Vmax , corresponding at the attainment of V max , and the drift ratio θ 20%drop evaluated at a strength reduction equal to 0. 2V max . Although a slight underestimation of V max can be noticed, the comparison between experimental and numerical results confirmed the effectiveness of the proposed modelling approach.

Table 3. Comparison between experimental and numerical results. Specimen k el (kN/mm) V max (kN) θ Vmax (%)

θ 20%drop (%)

Experimental 190.7

239.4 189.8 238.9 207.8

0.08 0.08 0.10 0.24

0.14 0.14 0.57 0.55

UBPS01

Numerical

203.7

Experimental 188.7

RBPS01

Numerical

188.3