1. Dept. of Civil, Environment, Land and Architecture Engineering and Mathematics (DICATAM), Univ. of Brescia, via Branze 43, 25123 Brescia, Italy (corresponding author). ORCID: .
2. Dept. of Studies and Researches of CTM SpA, viale Trieste 159/3, 09123 Cagliari, Italy.
3. General Management of CTM SpA, viale Trieste 159/3, 09123 Cagliari, Italy.