1. Member, ASCE
2. Res. Fellow, Dept. of Civ. and Envir. Engrg., Univ. of Perugia, Via G. Duranti 93, 06125 Perugia, Italy. E-mail: mami@unipg.it
3. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Perugia, Via G. Duranti 93, 06125 Perugia, Italy. E-mail: guse@unipg.it
4. Prof., School of Civ. and Envir. Engrg., Cornell Univ., Ithaca, NY 14853. E-mail: mdg12@cornell.edu