1. Postdoctoral Research Scholar, Dept. of Engineering, Roma Tre Univ., via Vito Volterra 62, Rome 00146, Italy (corresponding author).
2. Postdoctoral Research Scholar, Dept. of Civil, Constructional and Environmental Engineering, Sapienza Univ. of Rome, via Eudossiana 18, Rome 00184, Italy.
3. Professor, Dept. of Engineering, Roma Tre Univ., via Vito Volterra 62, Rome 00146, Italy.
4. Professor, Dept. of Civil, Constructional and Environmental Engineering, Sapienza Univ. of Rome, via Eudossiana 18, Rome 00184, Italy.