1. Professor, Dept. of Civil, Construction and Environmental Engineering, Università di Napoli Federico II, via Claudio 21, 80125 Napoli, Italy.
2. Researcher, Dept. of Civil, Construction and Environmental Engineering, Università di Napoli Federico II, via Claudio 21, 80125 Napoli, Italy (corresponding author).
3. Researcher, Dept. of Civil, Environmental and Aerospace Engineering, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.
4. Professor, Dept. of Civil, Environmental and Aerospace Engineering, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy.