1. Associate Professor, Dept. of Environment, Land and Infrastructures Engineering (DIATI), Politecnico di Torino, 24, corso Duca degli Abruzzi, 10129 Torino, Italy (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 3250 Kim Bldg., College Park, MD 20742.
3. M.S. Student, Dept. of Environment, Land and Infrastructures Engineering (DIATI), Politecnico di Torino, 24, corso Duca degli Abruzzi, 10129 Torino, Italy.
4. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 3250 Kim Bldg., College Park, MD 20742.