PSI - Issue 64

Maria Ntina et al. / Procedia Structural Integrity 64 (2024) 2036–2043 Author name / Structural Integrity Procedia 00 (2019) 000–000

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showed the largest capacity increase while among the SMA schemes Ni-Ti showed a slight increase compared to Cu-Al-Mn and Cu-Al-Be schemes which showed similar performances.

Fig. 3. Pushover curves for uniform load: (a) X+0.3Y; (b) 0.3X+Y.

Fig. 4. Pushover curves for modal load: (a) X+0.3Y; (b) 0.3X+Y.

To further assess the SMA potential in RC retrofit, non-linear dynamic time history analysis was conducted under significant earthquakes that have occurred in Greece and worldwide the last 40 years. The main data of the selected earthquakes are presented in Table 2. Maximum and residual displacements in X- and Y-directions regarding point A of the structure, as depicted in Fig. 1b, are presented in Tables 3 and 4 for the initial structure, the steel and the SMA retrofitted structures. As observed in Table 3, SMA schemes decreased maximum displacements. The reduction for most cases was similar to the reduction obtained from the steel retrofit scheme. As it is readily perceived in Table 4, SMA schemes showed considerable reduction of residual displacements for Athens, Kozani and Aigio earthquakes with Cu-Al-Mn and Cu-Al-Be exhibiting a larger decrease than the Ni-Ti scheme. For Kocaeli, Loma Prieta and Northridge earthquakes Ni-Ti and Cu-Al-Mn schemes demonstrated a residual