1. Graduate Student, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El Solh 1107 2020 Beirut, Lebanon.
2. Professor, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El Solh 1107 2020 Beirut, Lebanon (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El Solh 1107 2020 Beirut, Lebanon.