PSI - Issue 78

Michele D’Amato et al. / Procedia Structural Integrity 78 (2026) 1490–1496

1493

a

b

c

MODE 1 Translational along X M [%] = 63.94% T = 0.566 s

MODE 3 Translational along Y M [%] = 67.03% T = 0.387 s

MODE 4 Rotational around Z M [%] = 53.81% T = 0.326 s

Fig. 2 . Modal analysis of the isolated “lamione” in MIDAS FEA NX: (a) mode 1; (b) mode 3; (c) mode 4.

Moreover, a parametric assessment is made, by varying the wall thickness and considering any additional load, due to a non-pushing roofing for example. In this way, nine sub-samples of buildings are obtained, as shown in Table 2. Fig. 3 shows the comparison between capacity and demand for the nine sub-samples obtained. It should be noted that the collapse mechanism is not verified only for the sub-samples having load-bearing walls of low thickness, while the capacity increases as the masonry thickness and the additional load increase.

Table 2. Isolated “lamione” sub-samples. Acronym

Additional load [kN]

Wall thickness [cm]

a1 a2 a3 b1 b2 b3 c1 c2 c3

0 0 0

75 90

100

50 50 50

75 90

100

100 100 100

75 90

100

Fig. 3. Values of a g(LSLS) for the isolated “lamione” sub -samples.