1. Dr., Dept. of Civil and Environmental Engineering, Univ. of Trento, via Mesiano 77, Trento 38050, Italy (corresponding author)..
2. Dr., Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Genova, via Montallegro 1, Genova 16145, Italy.
3. Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Genova, via Montallegro 1, Genova 16145, Italy.