PSI - Issue 78

Laura Giovanna Guidi et al. / Procedia Structural Integrity 78 (2026) 2154–2161

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secondary elements, the infill panels exert a structurally relevant effect by limiting global deformations and enhancing the longitudinal dynamic response. Along the Y-axis, the full model shows a cumulative participating mass of around 67%, also higher than that of the model infill panels. This result suggests that the stiffening effect provided by the cornices also contributes to the transverse response, albeit to a lesser extent than in the longitudinal direction. In both directions, the comparison highlights the ability of the infill panels to substantially modify the distribution of effective modal mass, with significant implications on the natural vibration periods and the overall stiffness of the system. Table 1 Dynamic characteristics of Body 1: periods and participating mass ratios. Mode Period [sec] UX [-] UY[-] UZ [-] 1 6.6268 0.6257 1.834E-08 4.2E-13 2 1.1074 0.1849 0.00000017 1.165E-11 3 0.8402 1.615E-08 0.47699 0.00002247 4 0.4370 5.192E-08 0.2095 0.00004864 5 0.4034 0.06574 6.864E-07 1.036E-10 6 0.3450 4.824E-07 0.08352 0.00001248 7 0.2130 0.03142 0.000003965 2.852E-08 8 0.2017 8.813E-07 0.03282 0.00006199 9 0.1315 0.00001641 0.01756 0.0005 Table 2 Dynamic characteristics of Global Models: periods and participating mass ratios of the earliest main modes Global Model without infill panels Global Model with infill panels Mode Period [sec] UX [-] UY [-] UZ [-] Mode Period [sec] UX [-] UY [-] UZ [-] .1.1991 0.0426 0.0216 0.0000 1 0.4558 0.097 0.2390 0.0000 2 1.163 0.3414 0.0414 0.0000 2 0.3798 0.4725 0.195 0.0001 3 0.97208 0.0207 0.4218 0.0000 7 0.2943 0.0773 0.0239 0.0004 9 0.3416 0.0077 0.0761 0.0001 39 0.1659 0.0013 0.0691 0.0001 117 0.0758 0.0000 0.0302 0.0004 64 0.1395 0.00771 0.0327 0.0003 ∑ - 0.9656 0.9517 0.1342 ∑ - 0.7849 0.6767 0.0052

Fig. 5 Main modal shapes of Global Models: comparison to evaluate the effect of infill panels