1. Associate Professor, Dept. of Civil Engineering and Architecture, Univ. of Catania, Viale Andrea Doria 6, 95125 Catania, Italy (corresponding author).
2. Professor, Dept. of Civil Engineering and Architecture, Univ. of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
3. Research Fellow, Dept. of Civil Engineering and Architecture, Univ. of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
4. Chief Researcher, SINTEF Building and Infrastructure, Blindern, NO-0314 Oslo, Norway.
5. Operational Engineer, Dept. of Water and Wastewater, Oppegård kommune, Sofiemyrveien 8, Sofiemyr, 1412 Oppegård, Norway.