1. PhD, Dept. of Structural and Geotechnical Engineering, Univ. of Genoa, Via Montallegro 1, 16145 Genova, Italy (corresponding author).
2. Professor and Dept. Head, Dept. of Structural and Geotechnical Engineering, Univ. of Genoa, Via Montallegro 1, 16145 Genova, Italy.