1. Fellow, European Organization for Nuclear Research (CERN), Occupational Health and Safety and Environmental Protection Unit, Safety Engineering and Environment Group, Prevention and Safety Engineering Expertise Section (DGS-SEE-XP), CH-1211 Geneva 23, Switzerland (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering and Director, MAE Center, Univ. of Illinois at Urbana-Champaign, Newmark Civil Engineering Laboratory, 205 North Mathews Ave., Urbana, IL 61801-2352.
3. Full Professor, Dept. of Energy, Systems, Territory and Constructions Engineering (DESTEC), Univ. of Pisa, Largo Lucio Lazzarino, 1 – 56126 Pisa, Italy.
4. Associate Professor, Dept. of Energy, Systems, Territory and Constructions Engineering (DESTEC), Univ. of Pisa, Largo Lucio Lazzarino, 1 – 56126 Pisa, Italy.