1. Full Professor, Dept. of Civil and Environmental Engineering, Politecnico di Bari, via E. Orabona n.4, 70125 Bari, Italy (corresponding author).
2. Full Professor, Dept. of Environmental, Land, and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi n.24, 10129 Torino, Italy.