1. Full Professor, DISTART - Structural Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy (corresponding author). E-mail: marco.savoia@mail.ing.unibo.it
2. PhD Student, DISTART - Structural Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy. E-mail: barbara.ferracuti@mail.ing.unibo.it
3. Assistant Professor, DISTART - Structural Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy. E-mail: claudio.mazzotti@mail.ing.unibo.it