1. Professor, Dept. of Structural Engineering, “Sapienza”–Univ. of Rome, via Eudossiana 18, 00184 Roma, Italy.
2. Assistant Professor, Dept. of Structural Engineering, “Sapienza”–Univ. of Rome, via Eudossiana 18, 00184 Roma, Italy (corresponding author).
3. Associate Professor, Dept. of Structural Engineering, Univ. of Basilicata, C. da Macchia Romana, 85100 Potenza, Italy.
4. Research Fellow, Dept. of Structural Engineering, Univ. of Basilicata, C. da Macchia Romana, 85100 Potenza, Italy.
5. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.