PSI - Issue 44

Greta Agata Venneri et al. / Procedia Structural Integrity 44 (2023) 291–298 Greta Agata Venneri et al. / Structural Integrity Procedia 00 (2022) 000–000

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that, for moment-resisting frames, the peak interstorey drift ratio provides a good estimate of the expected damage (Barroso, L.R. and Winterstein 2002) and a well-established compromise between local and global response measures. For this reason, in the present study, the demand for maximum interstorey displacement is considered as measure of damage and limit conditions (Farsangi et al. 2014). ( ) = ( ≥ | = ) = . 0 / 1 ⋅ 5 6 6 7 7 1 888888 9: (1) For each performance level (IO, LS and CP), the fragility curves of the models with theoretical rigid joints were compared with the results of the models with the actual semi-rigid joints. The comparisons between the extracted fragility curves for the case study buildings are illustrated in Fig. 4 and Fig. 5, where “R” and “SR” indicate the model with rigid joints and the model with semi-rigid joints, respectively.

Fig. 4. (a) Fragility curves of Case study 1in H1 direction; (b) Fragility curves of Case study 1 in H2 direction.

Fig. 5. (a) Fragility curves of Case study 2 in H1 direction; (b) Fragility curves of Case study 2 in H2 direction.

Results in terms of fragility curves demonstrate that the presence of semi-rigid joints affect the global seismic performances of the examined multi-storey steel frames. Fig. 4(a) shows that, in the H1 direction, the semi-rigid model