1. Professor of Civil Engineering, Dept. DISTART, Univ. of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.
2. Associate Professor, Dept. DISTART, Univ. of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.
3. PhD, Dept. DISTART, Univ. of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.