1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Florence, via di S. Marta 3, I-50139 Florence, Italy.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Florence, via di S. Marta 3, I-50139 Florence, Italy (corresponding author).
3. Research Fellow, Dept. of Civil and Environmental Engineering, Univ. of Florence, via di S. Marta 3, I-50139 Florence, Italy.
4. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Florence, via di S. Marta 3, I-50139 Florence, Italy.