1. Postdoctoral Researcher, Dept. of Structural and Geotechnical Engineering, Sapienza Univ. of Rome, Via A. Gramsci, 53, 00197 Rome, Italy (corresponding author).
2. Assistant Professor, Dept. of Environmental Engineering, Polytechnic of Bari, Via Orabona 4, 70125 Bari, Italy.
3. Associate Professor, Dept. of Civil Engineering and Architecture, Polytechnic of Bari, Via Orabona 4, 70125 Bari, Italy.
4. Full Professor, Dept. of Structural and Geotechnical Engineering, Sapienza Univ. of Rome, Via A. Gramsci, 53, 00197 Rome, Italy.