1. Department of Civil Engineering and Architecture; University of Pavia, via Ferrata 1; Pavia 27100 Italy
2. Department of Civil, Environmental, Architectural Engineering, and Mathematics; University of Brescia, via Branze 43; Brescia 25123 Italy
3. Department of Mechanical and Industrial Engineering; University of Brescia, via Branze 38; Brescia 25123 Italy