PSI - Issue 70

Aman Kumar et al. / Procedia Structural Integrity 70 (2025) 255–262

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Fig. 4. The x- and y-directions pushover curves of the building

4.3. Effect on seismic vulnerability The x- and y-directions fragility curve of the building are presented in Figure 5. Various coloured nonlinear continuous lines represent the fragility curves of different damage states such slight, moderate, extreme, and collapse damage states. The vertical dotted lines represent the average seismic response (spectral displacement) of the building for original and amplified ground motion. The probability of damage in different damage states is estimated from the corresponding fragility curve of the building in the x and y directions for both original and amplified responses, as shown in Figure 6.

Fig. 5.The x- and y- directions fragility curve of the building

Figure 6 represents the cumulative damage of the building in slight, moderate, extreme, and collapse damage states. The result shows that the damage probability of the building has significantly increased by 9-12% in the slight damage state, 18-22.5% in the moderate, 37-38.5% in the extreme, and 17-18.5% in the collapse damage state due to the soil amplification effect. Thus, the above results show that the soil amplification significantly impacts the structural performance. The increase in base shear, roof displacement, ductility demand, and spectral displacement indicates that