1. Ph.D. Candidate, Dept. of Structures, Univ. of Naples Federico II, Via Claudio 21, Naples, Italy.
2. Assistant Professor, Dept. of Structures, Univ. of Naples Federico II, Via Claudio 21, Naples, Italy (corresponding author).
3. Associate Professor, Dept. of Structures, Univ. of Naples Federico II, Via Claudio 21, Naples, Italy.
4. Full Professor, Dept. of Structures, Univ. of Naples Federico II, Via Claudio 21, Naples, Italy.