1. Assistant Professor, Dept. of Structural Engineering, Univ. of Calabria, 87030 Rende (Cosenza), Italy.
2. Professor, Dept. of Structural Engineering, Univ. of Calabria, 87030 Rende (Cosenza), Italy.
3. Professor, Dept. of Mechanical Engineering, Univ. of Sheffield, Sheffield S1 3JD, UK.