1. Assoc. Prof., Dept. of Civ. and Envir. Engrg., American Univ. of Beirut, Beirut, Lebanon; mailing address: Facu. of Engrg. and Arch., American Univ. of Beirut, 850 Third Ave., New York, NY 10022 (corresponding author). E-mail: mfadel@aub.edu.lb
2. Grad. Student, Dept. of Civ. and Envir. Engrg., American Univ. of Beirut, Beirut, Lebanon.