1. Researcher, Dept. of Civil And Environmental Engineering, Univ. of Trieste, Piazzale Europa, 1, 34100 Trieste, Italy.
2. Professor, Dept. of Civil And Environmental Engineering, Univ. of Trieste, Piazzale Europa, 1, 34100 Trieste, Italy.
3. Associate Professor, Dept. of Civil And Environmental Engineering, Univ. of Trieste, Piazzale Europa, 1, 34100 Trieste, Italy (corresponding author).