1. Research Associate, Dept. of Civil and Environmental Engineering, ATLSS Center, Lehigh Univ., 117 ATLSS Drive, Bethlehem, PA 18015.
2. Assistant Professor, Dept. of Civil, Environmental, and Metals Engineering (DICAM), Univ. of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy (corresponding author).
3. Full Professor, Dept. of Civil, Environmental, and Metals Engineering (DICAM), Univ. of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy.