PSI - Issue 78

Marco Terrenzi et al. / Procedia Structural Integrity 78 (2026) 418–425

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This trend is consistent for the IF building (Figure 5); however, the observed response reductions due to modal damping are more pronounced for the IF building compared to the BF building. In both cases, the reductions in the Y-direction are consistently smaller than those in the X-direction.

3.3. Comparing Rayleigh and Modal Damping

A comparison of the two damping approaches (Rayleigh and Modal Damping) was carried out in terms of the maximum RD in both directions for the BF and IF building models. Figure 6 shows that, for the BF building,modal damping responses in the X direction fall between those of the two Rayleigh damping cases. In the Y direction, however, modal damping leads to lower RD demands compared to both Rayleigh cases.In both directions, modal damping results are closer to those obtained with Rayleigh damping using k comm thanwith k init .

Fig. 6: NTHAs of BF building: Comparison of Rayleigh using k init , k comm and Modal damping in terms of maximum RD in X and Y directions

Fig. 7: NTHAs of IF building: Comparison of Rayleigh using k init , k comm and Modal damping in terms of maximum RD in X and Y directions