1. Research Engineer, Dept. of Civil Engineering, Univ. of Trieste, Piazzale Europa 1, 34127 Italy.
2. Associate Professor, Dept. of Civil Engineering, Univ. of Trieste, Piazzale Europa 1, 34127 Italy.
3. PhD Student, Dept. of Civil Engineering, Univ. of Trieste, Piazzale Europa 1, 34127 Italy.