1. Full Professor, Civil Engineering and Architecture Dept., Technical Univ. of Bari, Via E. Orabona 4, 70125 Bari, Italy (corresponding author).
2. Research Fellow, Civil Engineering and Architecture Dept., Technical Univ. of Bari, Via E. Orabona 4, 70125 Bari, Italy.
3. Assistant Professor, Civil Engineering and Architecture Dept., Technical Univ. of Bari, Via E. Orabona 4, 70125 Bari, Italy.