1. Professor, Dept. of Civil, Building and Environmental Engineering, Sapienza Univ. of Rome, Via Eudossiana 18, Rome 00184, Italy.
2. Research Fellow, DICEA Sapienza Univ. of Rome, Via Eudossiana 18, 00184 Rome, Italy.
3. Ph.D. Candidate, Dept. of Civil, Building and Environmental Engineering, Sapienza Univ. of Rome, Via Eudossiana 18, Rome 00184, Italy (corresponding author).